Species Recorded | Taxon | Scientific Name | Common Name | Records | Latest |
| algae or stonewort | Bostrychia scorpioides | an alga | 2 | 2016 |
| amphibian | Bufo bufo | Common Toad | 3176 | 2025 |
| ant, bee, wasp, sawfly or ichneumon (and others) | Banchus volutatorius | an ichneumon wasp | 2 | 2016 |
| ant, bee, wasp, sawfly or ichneumon (and others) | Basalys crassiceps | a small parasitic wasp | 1 | 1997 |
| ant, bee, wasp, sawfly or ichneumon (and others) | Belyta forticornis | a small parasitic wasp | 2 | 2003 |
| ant, bee, wasp, sawfly or ichneumon (and others) | Belyta rugosicollis | a small parasitic wasp | 2 | 2009 |
| ant, bee, wasp, sawfly or ichneumon (and others) | Biorhiza pallida | Oak Apple | 52 | 2023 |
| ant, bee, wasp, sawfly or ichneumon (and others) | Biorhiza pallida f. sexual | Oak-apple Causer | 43 | 2002 |
| ant, bee, wasp, sawfly or ichneumon (and others) | Blacus ruficornis | a braconid wasp | 1 | 2003 |
| ant, bee, wasp, sawfly or ichneumon (and others) | Blennocampa phyllocolpa | Rose Leaf-roller Sawfly | 2 | 2020 |
| ant, bee, wasp, sawfly or ichneumon (and others) | Bombus | Bumblebee | 1142 | 2024 |
| ant, bee, wasp, sawfly or ichneumon (and others) | Bombus barbutellus | Barbut's Cuckoo Bee | 9 | 2019 |
| ant, bee, wasp, sawfly or ichneumon (and others) | Bombus bohemicus | Gipsy Cuckoo Bee | 4 | 1999 |
| ant, bee, wasp, sawfly or ichneumon (and others) | Bombus campestris | Field Cuckoo Bee | 47 | 2021 |
| ant, bee, wasp, sawfly or ichneumon (and others) | Bombus hortorum | Small Garden Bumblebee | 394 | 2024 |
| ant, bee, wasp, sawfly or ichneumon (and others) | Bombus humilis | Brown-banded Carder Bee | 3 | 2016 |
| ant, bee, wasp, sawfly or ichneumon (and others) | Bombus hypnorum | Tree Bumblebee | 416 | 2024 |
| ant, bee, wasp, sawfly or ichneumon (and others) | Bombus lapidarius | Red-tailed Bumblebee | 1309 | 2025 |
| ant, bee, wasp, sawfly or ichneumon (and others) | Bombus lucorum | White-tailed Bumblebee | 588 | 2025 |
| ant, bee, wasp, sawfly or ichneumon (and others) | Bombus lucorum/terrestris | White/Buff-Tailed Bumblebee Workers | 22 | 2023 |
| ant, bee, wasp, sawfly or ichneumon (and others) | Bombus muscorum | Moss Carder-bee | 5 | 2021 |
| ant, bee, wasp, sawfly or ichneumon (and others) | Bombus pascuorum | Common Carder Bee | 1996 | 2025 |
| ant, bee, wasp, sawfly or ichneumon (and others) | Bombus pratorum | Early Bumblebee | 767 | 2024 |
| ant, bee, wasp, sawfly or ichneumon (and others) | Bombus (Psithyrus) | Cuckoo bee | 3 | 2012 |
| ant, bee, wasp, sawfly or ichneumon (and others) | Bombus ruderarius | Red-tailed Carder Bee | 27 | 2014 |
| ant, bee, wasp, sawfly or ichneumon (and others) | Bombus ruderatus | Large Garden Bumble Bee | 2 | 2023 |
| ant, bee, wasp, sawfly or ichneumon (and others) | Bombus rupestris | Hill Cuckoo Bee | 29 | 2022 |
| ant, bee, wasp, sawfly or ichneumon (and others) | Bombus subterraneus | Short Haired Bumble Bee | 1 | 1995 |
| ant, bee, wasp, sawfly or ichneumon (and others) | Bombus sylvarum | Shrill Carder Bee | 4 | 2011 |
| ant, bee, wasp, sawfly or ichneumon (and others) | Bombus sylvestris | Forest Cuckoo Bumble Bee | 34 | 2024 |
| ant, bee, wasp, sawfly or ichneumon (and others) | Bombus terrestris | Buff-tailed Bumblebee | 1593 | 2025 |
| ant, bee, wasp, sawfly or ichneumon (and others) | Bombus vestalis | Vestal Cuckoo Bee | 157 | 2024 |
| ant, bee, wasp, sawfly or ichneumon (and others) | Bootanomyia dorsalis | a chalcid wasp | 26 | 2003 |
| ant, bee, wasp, sawfly or ichneumon (and others) | Bracon erraticus | a braconid wasp | 1 | 1997 |
| ant, bee, wasp, sawfly or ichneumon (and others) | Braconidae | a Braconidae species (unidentified) | 1 | 2013 |
| ant, bee, wasp, sawfly or ichneumon (and others) | Bracon minutator | a braconid wasp | 2 | 1995 |
| ant, bee, wasp, sawfly or ichneumon (and others) | Bracon terebella | a braconid wasp | 1 | 2008 |
| ant, bee, wasp, sawfly or ichneumon (and others) | Bracon variator | a braconid wasp | 3 | 2009 |
| ant, bee, wasp, sawfly or ichneumon (and others) | Buathra laborator | an insect - hymenopteran | 5 | 2022 |
| beetle | Badister | a Badister species (unidentified) | 1 | 2014 |
| beetle | Badister bullatus | a ground beetle | 42 | 2024 |
| beetle | Badister unipustulatus | a ground beetle | 4 | 2018 |
| beetle | Bagous limosus | a weevil | 4 | 2011 |
| beetle | Bagous tempestivus | a weevil | 4 | 1983 |
| beetle | Barynotus | a Barynotus species (unidentified) | 1 | 2019 |
| beetle | Barynotus moerens | a weevil | 1 | 2024 |
| beetle | Barynotus obscurus | Ground Weevil | 6 | 2020 |
| beetle | Barypeithes | a Barypeithes species (unidentified) | 1 | 2023 |
| beetle | Batophila aerata | Raspberry Flea Beetle | 8 | 2023 |
| beetle | Batophila rubi | Raspberry Flea Beetle | 1 | 2003 |
| beetle | Bembidion | a Bembidion species (unidentified) | 2 | 2023 |
| beetle | Bembidion aeneum | a ground beetle | 36 | 2023 |
| beetle | Bembidion assimile | a ground beetle | 6 | 2019 |
| beetle | Bembidion biguttatum | a ground beetle | 14 | 2023 |
| beetle | Bembidion bipunctatum | a ground beetle | 1 | 1985 |
| beetle | Bembidion dentellum | a ground beetle | 2 | 2017 |
| beetle | Bembidion doris | a ground beetle | 4 | 2019 |
| beetle | Bembidion fumigatum | a ground beetle | 1 | 2020 |
| beetle | Bembidion genei | a ground beetle | 2 | 2018 |
| beetle | Bembidion guttula | a ground beetle | 75 | 2023 |
| beetle | Bembidion iricolor | a ground beetle | 27 | 2021 |
| beetle | Bembidion lampros | a ground beetle | 126 | 2024 |
| beetle | Bembidion lunatum | a ground beetle | 1 | 2021 |
| beetle | Bembidion lunulatum | a ground beetle | 47 | 2023 |
| beetle | Bembidion mannerheimii | a ground beetle | 5 | 2023 |
| beetle | Bembidion maritimum | a ground beetle | 3 | 2018 |
| beetle | Bembidion minimum | a ground beetle | 21 | 2021 |
| beetle | Bembidion normannum | a ground beetle | 1 | 2017 |
| beetle | Bembidion obtusum | a ground beetle | 91 | 2023 |
| beetle | Bembidion properans | a ground beetle | 17 | 2023 |
| beetle | Bembidion quadrimaculatum | a ground beetle | 33 | 2025 |
| beetle | Bembidion tetracolum | an insect - beetle (Coleoptera) | 40 | 2023 |
| beetle | Bembidion varium | a ground beetle | 5 | 2021 |
| beetle | Berosus affinis | a scavenger water beetle | 115 | 2023 |
| beetle | Berosus signaticollis | a scavenger water beetle | 2 | 2009 |
| beetle | Betulapion simile | a seed weevil | 2 | 2021 |
| beetle | Bibloplectus ambiguus | a short-winged mould beetle | 1 | 1983 |
| beetle | Bibloporus bicolor | a short-winged mould beetle | 3 | 2020 |
| beetle | Biphyllus lunatus | a biphyllid beetle | 11 | 2021 |
| beetle | Bisnius fimetarius | a rove beetle | 8 | 2020 |
| beetle | Bisnius sordidus | a rove beetle | 2 | 2008 |
| beetle | Bitoma crenata | a narrow timber beetle | 1 | 2001 |
| beetle | Blaps lethifera | a darkling beetle | 1 | 1920 |
| beetle | Blaps mucronata | Cellar Beetle | 9 | 2013 |
| beetle | Bledius gallicus | a rove beetle | 2 | 1986 |
| beetle | Bodilopsis rufa | a dung beetle or chafer | 8 | 2023 |
| beetle | Bolitobius castaneus | an insect - beetle (Coleoptera) | 4 | 2021 |
| beetle | Bolitobius cingulatus | a rove beetle | 7 | 2020 |
| beetle | Bolitochara obliqua | a rove beetle | 1 | 2001 |
| beetle | Brachinus crepitans | Bombardier Beetle | 2 | 1953 |
| beetle | Brachygluta haematica | a short-winged mould beetle | 2 | 2023 |
| beetle | Brachygluta helferi | a short-winged mould beetle | 15 | 2019 |
| beetle | Brachygluta waterhousei | a short-winged mould beetle | 2 | 2019 |
| beetle | Brachypera zoilus | a weevil | 5 | 2018 |
| beetle | Brachypterus glaber | a pollen or sap beetle | 11 | 2020 |
| beetle | Brachypterus urticae | Nettle Pollen Beetle | 30 | 2023 |
| beetle | Bradycellus harpalinus | a ground beetle | 5 | 2021 |
| beetle | Bradycellus verbasci | a ground beetle | 53 | 2024 |
| beetle | Broscus cephalotes | a ground beetle | 1 | 1995 |
| beetle | Bruchidius | a Bruchidius species (unidentified) | 2 | 2023 |
| beetle | Bruchidius cisti | a seed beetle | 1 | 2001 |
| beetle | Bruchidius varius | a seed beetle | 7 | 2023 |
| beetle | Bruchidius villosus | a seed beetle | 1 | 2017 |
| beetle | Bruchus atomarius | a seed beetle | 4 | 2021 |
| beetle | Bruchus loti | a seed beetle | 9 | 2021 |
| beetle | Bruchus pisorum | Pea Beetle | 3 | 2023 |
| beetle | Bruchus rufimanus | Bean Beetle | 15 | 2023 |
| beetle | Bruchus rufipes | a seed beetle | 7 | 2022 |
| beetle | Bryaxis bulbifer | a short-winged mould beetle | 2 | 2016 |
| beetle | Bryaxis curtisii | an insect - beetle (Coleoptera) | 4 | 2020 |
| beetle | Brychius elevatus | a crawling water beetle | 1 | 2000 |
| beetle | Byrrhus pilula | Pill Beetle | 11 | 2017 |
| beetle | Byturus | a Byturus species (unidentified) | 2 | 2023 |
| beetle | Byturus ochraceus | a raspberry beetle | 45 | 2024 |
| beetle | Byturus tomentosus | Raspberry Beetle | 67 | 2023 |
| bird | Bartramia longicauda | Upland Sandpiper | 3 | 2005 |
| bird | Bombycilla garrulus | Waxwing | 582 | 2024 |
| bird | Botaurus minutus | Little Bittern | 4 | 2020 |
| bird | Botaurus stellaris | Bittern | 845 | 2022 |
| bird | Branta | a Branta goose (unidentified) | 23 | 2019 |
| bird | Branta bernicla | Brent Goose | 589 | 2022 |
| bird | Branta bernicla bernicla | Dark-bellied Brent Goose | 54 | 2019 |
| bird | Branta bernicla hrota | Pale-bellied Brent Goose | 27 | 2012 |
| bird | Branta bernicla x Branta leucopsis | Brent Goose x Barnacle Goose | 2 | 2018 |
| bird | Branta canadensis | Canada Goose | 20052 | 2025 |
| bird | Branta leucopsis | Barnacle Goose | 1591 | 2023 |
| bird | Branta ruficollis | Red-breasted Goose | 76 | 2016 |
| bird | Bubo bubo | Eagle Owl | 4 | 2009 |
| bird | Bucephala albeola | Bufflehead | 11 | 2018 |
| bird | Bucephala clangula | Goldeneye | 4538 | 2022 |
| bird | Burhinus oedicnemus | Stone-curlew | 14 | 2020 |
| bird | Buteo | a buzzard (unidentified) | 55 | 2006 |
| bird | Buteo buteo | Buzzard | 32558 | 2025 |
| bird | Buteo lagopus | Rough-legged Buzzard | 1 | 1986 |
| bug | Balclutha punctata | a leafhopper | 2 | 2021 |
| bug | Berytinus | a Berytinus species (unidentified) | 1 | 2006 |
| bug | Berytinus (Berytinus) minor | a stiltbug | 2 | 2015 |
| bug | Blepharidopterus angulatus | Black-kneed Apple Capsid | 24 | 2023 |
| bug | Brachyarthrum limitatum | a plantbug or grassbug | 3 | 2020 |
| bug | Brachycaudus (Acaudus) klugkisti | an aphid | 1 | 2015 |
| bug | Brachycaudus (Brachycaudus) helichrysi | Leaf-curling Plum Aphid | 29 | 1975 |
| bug | Brachycaudus (Prunaphis) cardui | Thistle Aphid | 1 | 2003 |
| bug | Brevicoryne brassicae | Cabbage Aphid | 14 | 1975 |
| bug | Bryocoris pteridis | a plantbug or grassbug | 7 | 2015 |
| bug | Buchananiella continua | a flower bug | 2 | 2023 |
| caddis fly | Beraea pullata | a caddisfly | 2 | 2023 |
| caddis fly | Beraeodes minutus | a caddisfly | 1 | 2019 |
| cockroach | Blatta orientalis | Common Cockroach | 2 | 1986 |
| cockroach | Blattella germanica | German Cockroach | 2 | 2015 |
| crustacean | Bathyporeia pilosa | a crustacean | 1 | 1976 |
| crustacean | Branchiopoda | a Branchiopoda species (unidentified) | 1 | 1993 |
| diatom | Bacillariophyceae | a Bacillariophyta diatom (unidentified) | 1 | 1998 |
| dragonfly, hawker or damselfly | Brachytron pratense | Hairy Dragonfly | 258 | 2024 |
| fish | Balistes capriscus | Grey Trigger Fish | 1 | 1879 |
| fish | Barbatula barbatula | Stone Loach | 108 | 2022 |
| fish | Barbus barbus | Barbel | 1 | 1996 |
| fish | Belone belone | Garfish | 2 | 1879 |
| fish | Blicca bjoerkna | Silver Bream | 3 | 2017 |
| fish | Buenia jeffreysii | Jeffrey's Goby | 1 | 1999 |
| fungus | Bactridium flavum | a fungus | 4 | 2012 |
| fungus | Baeospora myosura | Conifercone Cap | 18 | 2021 |
| fungus | Balsamia platyspora | Broad-Spored Balsamia | 1 | 1959 |
| fungus | Bartheletia paradoxa | Ginkgo Dotty | 1 | 2018 |
| fungus | Basidioradulum radula | Toothed Crust | 12 | 2007 |
| fungus | Battarrea phalloides | Sandy Stilt Puffball | 3 | 2024 |
| fungus | Bertia moriformis | Wood Mulberry | 5 | 2008 |
| fungus | Biscogniauxia nummularia | Beech Tarcrust | 26 | 2017 |
| fungus | Bjerkandera | a Bjerkandera species (unidentified) | 2 | 2012 |
| fungus | Bjerkandera adusta | Smokey Bracket | 187 | 2025 |
| fungus | Bjerkandera fumosa | Big Smoky Bracket | 8 | 2009 |
| fungus | Blumeria graminis s. lat. | Grass and Cereal Powdery Mildew | 1 | 2023 |
| fungus | Boeremia exigua var. viburni | a fungus | 1 | 1998 |
| fungus | Boeremia hedericola | a root rot fungus | 43 | 2023 |
| fungus | Bolbitius lacteus | Creamy Fieldcap | 1 | 1997 |
| fungus | Bolbitius reticulatus | Netted Fieldcap | 5 | 2010 |
| fungus | Bolbitius titubans | Yellow Fieldcap | 154 | 2023 |
| fungus | Boletales | Bolete | 1 | 2010 |
| fungus | Boletus aestivalis | Summer Bolete | 1 | 1997 |
| fungus | Boletus edulis | Cep | 14 | 2021 |
| fungus | Bonomyces sinopicus | Spring Funnel | 15 | 2006 |
| fungus | Botryobasidium aureum | Golden Crust | 2 | 2008 |
| fungus | Botryobasidium laeve | Confluent Crust | 2 | 2014 |
| fungus | Botrytis cinerea | Grey Mould | 2 | 2023 |
| fungus | Bovista nigrescens | Brown Bovist | 9 | 2014 |
| fungus | Bovista plumbea | Lead-grey Bovist | 48 | 2015 |
| fungus | Bremia lactucae s. lat. | Lettuce Downy Mildew | 2 | 2008 |
| fungus | Brevicellicium olivascens | Granulated Crust | 1 | 2008 |
| fungus | Britzelmayria multipedata | Clustered Brittlestem | 18 | 2024 |
| fungus | Britzelmayria supernula | a fungus | 3 | 2010 |
| fungus | Bryocentria brongniartii | a fungus | 1 | 2023 |
| fungus | Buelliella physciicola | a fungus | 1 | 1991 |
| fungus | Buerenia inundata | an ascomycete fungus | 1 | 1997 |
| fungus | Buglossoporus quercinus | Oak Polypore | 3 | 2014 |
| fungus | Bulgaria inquinans | Black Bulgar | 26 | 2022 |
| fungus | Byssocorticium efibulatum | Loose Webcrust | 1 | 2014 |
| fungus | Byssomerulius corium | Netted Crust | 142 | 2025 |
| lichen | Bacidia fuscoviridis | a lichen | 2 | 2018 |
| lichen | Bacidina indigens | a lichen | 1 | 1991 |
| lichen | Bacidina phacodes | a lichen | 1 | 1991 |
| lichen | Bagliettoa calciseda | a lichen | 3 | 2016 |
| lichen | Bagliettoa parmigera s. lat. | a lichen | 35 | 2020 |
| lichen | Belonia calcicola | a lichen | 2 | 2005 |
| lichen | Bilimbia lobulata | a lichen | 1 | 2018 |
| lichen | Bilimbia sabuletorum | a lichen | 6 | 2018 |
| lichen | Blastenia crenularia | a lichen | 5 | 2010 |
| lichen | Blennothallia crispa | a lichen | 17 | 2023 |
| lichen | Botryolepraria lesdainii | a lichen | 11 | 2018 |
| lichen | Buellia aethalea | a lichen | 11 | 2016 |
| lichen | Buellia griseovirens | a lichen | 1 | 1996 |
| lichen | Buellia ocellata | a lichen | 12 | 2016 |
| lichen | Buellia saxorum | a lichen | 2 | 1985 |
| lichen | Buellia stellulata | a lichen | 3 | 2004 |
| mammal | Bos taurus | Domestic Cattle | 5 | 2019 |
| mammal - bat | Barbastella barbastellus | Barbastelle | 46 | 2024 |
| mammal - marine | Balaenoptera borealis | Sei Whale | 1 | 1925 |
| mammal - marine | Balaenoptera physalus | Fin Whale | 1 | 1885 |
| mayfly | Baetidae | Olives (Baetidae) | 39 | 2023 |
| mayfly | Baetis | a Baetis mayfly (unidentified) | 13 | 2023 |
| mayfly | Baetis fuscatus | a mayfly | 1 | 2022 |
| mayfly | Baetis muticus | Iron Blue Mayfly | 1 | 2008 |
| mayfly | Baetis rhodani/atlanticus | a mayfly | 25 | 2018 |
| mayfly | Baetis scambus | a mayfly | 3 | 2023 |
| mayfly | Baetis vernus | a mayfly | 2 | 2025 |
| millipede | Blaniulus guttulatus | Spotted Snake Millipede | 7 | 2008 |
| millipede | Brachydesmus | a Brachydesmus species (unidentified) | 1 | 2019 |
| millipede | Brachydesmus superus | a flat-back millipede | 2 | 1987 |
| mollusc | Backeljaia gigaxii | Eccentric Snail | 5 | 2010 |
| mollusc | Balea (Balea) perversa | Wall Snail | 3 | 2002 |
| mollusc | Balea (Balea) sarsii | Tree Snail | 4 | 2015 |
| mollusc | Bathyomphalus contortus | Twisted Ramshorn | 185 | 2016 |
| mollusc | Bithynia leachii | Leach's Bithynia | 71 | 2013 |
| mollusc | Bithynia tentaculata | Common Bithynia | 254 | 2022 |
| mollusc | Bithyniidae | a Bithyniidae species (unidentified) | 2 | 2000 |
| mollusc | Bivalvia | Bivalves | 1 | 2008 |
| mollusc | Boettgerilla pallens | Worm Slug | 3 | 2022 |
| mollusc | Buccinum undatum | Common Whelk | 10 | 2003 |
| moss | Barbula unguiculata | Bird's-claw Beard-moss | 90 | 2023 |
| moss | Brachytheciaceae | a Brachytheciaceae species (unidentified) | 1 | 2023 |
| moss | Brachytheciastrum velutinum | Velvet Feather-moss | 21 | 2011 |
| moss | Brachythecium | a Brachythecium moss (unidentified) | 8 | 2023 |
| moss | Brachythecium albicans | Whitish Feather-moss | 14 | 2023 |
| moss | Brachythecium glareosum | Streaky Feather-moss | 12 | 2023 |
| moss | Brachythecium mildeanum | Sand Feather-moss | 10 | 2021 |
| moss | Brachythecium rivulare | River Feather-moss | 17 | 2023 |
| moss | Brachythecium rutabulum | Rough-stalked Feather-moss | 417 | 2024 |
| moss | Bryoerythrophyllum recurvirostrum | Red Beard-moss | 25 | 2023 |
| moss | Bryophyta | Moss | 26 | 2023 |
| moss | Bryopsida | Moss | 33 | 2020 |
| moss | Bryum | a Bryum moss (unidentified) | 9 | 2013 |
| moss | Bryum archangelicum | Small-mouthed Thread-moss | 1 | 1963 |
| moss | Bryum argenteum | Silver-moss | 108 | 2023 |
| moss | Bryum bicolor | Bicoloured Bryum | 5 | 2016 |
| moss | Bryum caespiticium | Tufted Thread-moss | 10 | 2023 |
| moss | Bryum canariense | Canary Thread-moss | 6 | 1998 |
| moss | Bryum capillare | Capillary Thread-moss | 213 | 2023 |
| moss | Bryum dichotomum | Dune Thread-moss | 46 | 2023 |
| moss | Bryum donianum | Don's Thread-moss | 1 | 1963 |
| moss | Bryum klinggraeffii | Raspberry Bryum | 3 | 2021 |
| moss | Bryum kunzei | Funck's Thread-moss | 1 | 1979 |
| moss | Bryum moravicum | Flabby Thread-moss | 4 | 2015 |
| moss | Bryum pallens | Pale Thread-moss | 13 | 2023 |
| moss | Bryum pallescens | Tall-clustered Thread-moss | 1 | 1990 |
| moss | Bryum pseudotriquetrum | Marsh Bryum | 5 | 2020 |
| moss | Bryum pseudotriquetrum var. pseudotriquetrum | Long-leaved Thread-moss | 1 | 1986 |
| moss | Bryum radiculosum | Wall Thread-moss | 14 | 2023 |
| moss | Bryum rubens | Crimson-tuber Thread-moss | 34 | 2023 |
| moss | Bryum ruderale | Pea Bryum | 4 | 2023 |
| moss | Bryum subapiculatum | Lesser Potato Bryum | 2 | 1991 |
| moss | Bryum violaceum | Pill Bryum | 1 | 2020 |
| moth or butterfly - butterfly | Boloria euphrosyne | Pearl-bordered Fritillary | 47 | 2003 |
| moth or butterfly - butterfly | Boloria selene | Small Pearl-bordered Fritillary | 308 | 2023 |
| moth or butterfly - butterfly | Boloria selene/euphrosyne | Small Pearl-bordered or Pearl-bordered Fritillary | 1 | 1999 |
| moth or butterfly - macro moth | Bembecia ichneumoniformis | Six-belted Clearwing | 44 | 2023 |
| moth or butterfly - macro moth | Bena bicolorana | Scarce Silver-lines | 88 | 2025 |
| moth or butterfly - macro moth | Biston betularia | Peppered Moth | 1800 | 2025 |
| moth or butterfly - macro moth | Biston betularia form carbonaria | Peppered Moth (melanic form) | 7 | 2013 |
| moth or butterfly - macro moth | Biston betularia form insularia | Peppered Moth (intermediate) | 4 | 2015 |
| moth or butterfly - macro moth | Biston betularia form typica | Peppered Moth (light) | 1 | 2016 |
| moth or butterfly - macro moth | Biston strataria | Oak Beauty | 477 | 2024 |
| moth or butterfly - macro moth | Brachylomia viminalis | Minor Shoulder-knot | 58 | 2020 |
| moth or butterfly - macro moth | Bryophila domestica | Marbled Beauty | 1816 | 2024 |
| moth or butterfly - macro moth | Bryopsis muralis | Marbled Green | 999 | 2024 |
| moth or butterfly - macro moth | Bupalus piniaria | Bordered White | 47 | 2023 |
| moth or butterfly - micro moth | Bactra | a Bactra species (unidentified) | 8 | 2022 |
| moth or butterfly - micro moth | Bactra furfurana | Marsh Lance | 13 | 2023 |
| moth or butterfly - micro moth | Bactra lacteana | Sedge Lance | 2 | 2024 |
| moth or butterfly - micro moth | Bactra lancealana | Rush Marble | 113 | 2023 |
| moth or butterfly - micro moth | Bactra robustana | Saltern Lance | 4 | 2021 |
| moth or butterfly - micro moth | Batia | a Batia species (unidentified) | 1 | 2015 |
| moth or butterfly - micro moth | Batia lambdella | Tawny Crescent | 5 | 2019 |
| moth or butterfly - micro moth | Batia lunaris | Lesser Tawny Crescent | 88 | 2024 |
| moth or butterfly - micro moth | Batrachedra pinicolella | Spruce Needle-moth | 1 | 2021 |
| moth or butterfly - micro moth | Batrachedra praeangusta | Poplar Needle-moth | 27 | 2023 |
| moth or butterfly - micro moth | Bedellia somnulentella | Bindweed Sleeper | 23 | 2023 |
| moth or butterfly - micro moth | Blastobasis adustella | Furness Dowd | 1407 | 2025 |
| moth or butterfly - micro moth | Blastobasis lacticolella | Wakely's Dowd | 200 | 2024 |
| moth or butterfly - micro moth | Blastobasis rebeli | Black-banded Masoner | 2 | 2023 |
| moth or butterfly - micro moth | Blastodacna atra | Apple Pith Moth | 3 | 2021 |
| moth or butterfly - micro moth | Blastodacna hellerella | Hawthorn Berry Moth | 156 | 2023 |
| moth or butterfly - micro moth | Bohemannia pulverosella | Speckled Apple Dot | 13 | 2022 |
| moth or butterfly - micro moth | Bohemannia quadrimaculella | Four-spot Dot | 3 | 2011 |
| moth or butterfly - micro moth | Borkhausenia fuscescens | Dingy Concealer | 44 | 2023 |
| moth or butterfly - micro moth | Brachmia blandella | Gorse Wanderer | 28 | 2023 |
| moth or butterfly - micro moth | Bryotropha | a Bryotropha species (unidentified) | 3 | 2024 |
| moth or butterfly - micro moth | Bryotropha affinis | Dark Moss-moth | 133 | 2025 |
| moth or butterfly - micro moth | Bryotropha basaltinella | Dark-spotted Moss-moth | 4 | 2024 |
| moth or butterfly - micro moth | Bryotropha domestica | House Moss-moth | 184 | 2024 |
| moth or butterfly - micro moth | Bryotropha politella | Satin Moss-moth | 2 | 2021 |
| moth or butterfly - micro moth | Bryotropha senectella | Grizzled Moss-moth | 28 | 2021 |
| moth or butterfly - micro moth | Bryotropha terrella | Cinerous Groundling | 217 | 2023 |
| moth or butterfly - micro moth | Bucculatrix | a Bucculatrix micro-moth (unidentified) | 2 | 2019 |
| moth or butterfly - micro moth | Bucculatrix bechsteinella | Hawthorn Tuft | 2 | 2020 |
| moth or butterfly - micro moth | Bucculatrix cidarella | Alder Tuft | 1 | 2001 |
| moth or butterfly - micro moth | Bucculatrix cristatella | Yarrow Tuft | 1 | 2016 |
| moth or butterfly - micro moth | Bucculatrix frangutella | Buckthorn Tuft | 1 | 1993 |
| moth or butterfly - micro moth | Bucculatrix maritima | Saltern Tuft | 10 | 2016 |
| moth or butterfly - micro moth | Bucculatrix nigricomella | Daisy Tuft | 13 | 2023 |
| moth or butterfly - micro moth | Bucculatrix thoracella | Lime Tuft | 46 | 2022 |
| moth or butterfly - micro moth | Bucculatrix ulmella | Oak Tuft | 20 | 2022 |
| plant | Baldellia ranunculoides | Lesser Water-plantain | 44 | 2013 |
| plant | Ballota nigra | Black Horehound | 528 | 2024 |
| plant | Ballota nigra subsp. meridionalis | a flowering plant | 65 | 2022 |
| plant | Ballota nigra subsp. nigra | a flowering plant | 1 | 1916 |
| plant | Bambusa | Bamboo | 6 | 2013 |
| plant | Bambusa sp. or Sasa sp. or Sasaella sp. (unidentified bamboo) | a bambusa or a sasa or a sasaella bamboo (unidentified) | 2 | 2015 |
| plant | Barbarea | Winter-Cress | 9 | 2023 |
| plant | Barbarea intermedia | Medium-flowered Winter-cress | 36 | 2007 |
| plant | Barbarea stricta | Small-flowered Winter-cress | 1 | 1994 |
| plant | Barbarea verna | American Winter-cress | 26 | 2020 |
| plant | Barbarea vulgaris | Winter-cress | 810 | 2024 |
| plant | Bartsia alpina | Alpine Bartsia | 1 | 1999 |
| plant | Bassia scoparia | Summer-cypress | 21 | 2008 |
| plant | Beckmannia eruciformis | European Slough-grass | 2 | 1985 |
| plant | Beckmannia syzigachne | American Slough-grass | 2 | 1930 |
| plant | Bellis perennis | Daisy | 7074 | 2025 |
| plant | Berberis | a barberry (unidentified) | 17 | 2023 |
| plant | Berberis aggregata | Clustered Barberry | 1 | 2013 |
| plant | Berberis darwinii | Darwin's Barberry | 9 | 2023 |
| plant | Berberis darwinii x empetrifolia = B. x stenophylla | Hedge Barberry | 5 | 2019 |
| plant | Berberis julianae | Chinese Barberry | 4 | 2023 |
| plant | Berberis thunbergii | Thunberg's Barberry | 4 | 2019 |
| plant | Berberis vulgaris | Barberry | 15 | 2014 |
| plant | Berberis wilsoniae | Mrs Wilson's Barberry | 1 | 1997 |
| plant | Bergenia | a Bergenia species (unidentified) | 3 | 2023 |
| plant | Bergenia crassifolia | Elephant-ears | 11 | 2023 |
| plant | Berteroa incana | Hoary Alison | 3 | 1934 |
| plant | Berula | a Berula species (unidentified) | 2 | 1993 |
| plant | Berula erecta | Lesser Water-parsnip | 847 | 2024 |
| plant | Beta vulgaris | Beet | 11 | 2023 |
| plant | Beta vulgaris subsp. cicla | Foliage Beet | 2 | 1992 |
| plant | Beta vulgaris subsp. maritima | Sea Beet | 406 | 2019 |
| plant | Beta vulgaris subsp. vulgaris | Root Beet | 6 | 2017 |
| plant | Betonica officinalis | Betony | 959 | 2024 |
| plant | Betula | Birch | 269 | 2024 |
| plant | Betula albosinensis | White Birch | 1 | 1984 |
| plant | Betulaceae | a Betulaceae species (unidentified) | 2 | 2023 |
| plant | Betula ermanii | Erman's Birch | 1 | 2015 |
| plant | Betula nigra | Black Birch | 1 | 2000 |
| plant | Betula papyrifera | Paper Birch | 2 | 2015 |
| plant | Betula pendula | Silver Birch | 1867 | 2025 |
| plant | Betula pendula x pubescens = B. x aurata | Hybrid Birch | 3 | 2000 |
| plant | Betula pubescens | Downy Birch | 50 | 2023 |
| plant | Betula pubescens subsp. pubescens | a downy birch (subsp. pubescens) | 43 | 2005 |
| plant | Betula utilis | Himalayan Birch | 42 | 2015 |
| plant | Bidens aristosa | Western Tickseed | 1 | 1959 |
| plant | Bidens cernua | Nodding Bur-marigold | 8 | 2016 |
| plant | Bidens ferulifolia | Fern-leaved Beggarticks | 1 | 2013 |
| plant | Bidens frondosa | Beggarticks | 17 | 2016 |
| plant | Bidens pilosa | Black-jack | 1 | 1926 |
| plant | Bidens tripartita | Trifid Bur-marigold | 149 | 2023 |
| plant | Bifora radians | a flowering plant | 4 | 1954 |
| plant | Bifora testiculata | a flowering plant | 1 | 1917 |
| plant | Bistorta amplexicaulis | Red Bistort | 15 | 2017 |
| plant | Bistorta officinalis | Common Bistort | 17 | 2021 |
| plant | Blackstonia perfoliata | Yellow-wort | 506 | 2024 |
| plant | Blechnum spicant | Hard Fern | 86 | 2023 |
| plant | Blitum bonus-henricus | Good King Henry | 90 | 2017 |
| plant | Blysmus compressus | Flat-sedge | 9 | 2014 |
| plant | Bolboschoenus maritimus | Sea Club-rush | 273 | 2024 |
| plant | Boraginaceae | a Boraginaceae species (unidentified) | 4 | 2023 |
| plant | Borago officinalis | Borage | 96 | 2023 |
| plant | Botrychium lunaria | Moonwort | 23 | 2009 |
| plant | Brachyglottis x jubar | Shrub Ragwort | 4 | 2013 |
| plant | Brachypodium hybridum | Stiff Brome | 1 | 1938 |
| plant | Brachypodium pinnatum | Tor-grass | 139 | 2021 |
| plant | Brachypodium pinnatum sens. lat. | a tor-grass | 2 | 2013 |
| plant | Brachypodium rupestre | Tor-grass | 7 | 2019 |
| plant | Brachypodium sylvaticum | False-brome | 4301 | 2024 |
| plant | Brassica | a cabbage (unidentified) | 27 | 2023 |
| plant | Brassicaceae | Crucifer | 23 | 2023 |
| plant | Brassica elongata | Long-stalked Rape | 2 | 1927 |
| plant | Brassica juncea | Chinese Mustard | 17 | 2008 |
| plant | Brassica napus | Rape | 278 | 2024 |
| plant | Brassica napus subsp. oleifera | Oil-seed Rape | 26 | 2017 |
| plant | Brassica napus subsp. rapifera | Swede | 1 | 1931 |
| plant | Brassica nigra | Black Mustard | 399 | 2023 |
| plant | Brassica oleracea | Cabbage (plant) | 5 | 2020 |
| plant | Brassica oleracea var. oleracea | Wild Cabbage | 4 | 1992 |
| plant | Brassica rapa | Turnip (plant) | 33 | 2023 |
| plant | Brassica rapa subsp. campestris | Wild Turnip | 122 | 2018 |
| plant | Briza maxima | Greater Quaking Grass | 27 | 2022 |
| plant | Briza media | Quaking-grass | 1769 | 2024 |
| plant | Briza minor | Lesser Quaking-grass | 2 | 1996 |
| plant | Bromopsis benekenii | Lesser Hairy-brome | 1 | 1991 |
| plant | Bromopsis erecta | Upright Brome | 1791 | 2023 |
| plant | Bromopsis inermis | Hungarian Brome | 2 | 1926 |
| plant | Bromopsis inermis subsp. inermis | a hungarian brome | 5 | 1986 |
| plant | Bromopsis ramosa | Hairy Brome | 988 | 2020 |
| plant | Bromus | a Bromus species (unidentified) | 11 | 2023 |
| plant | Bromus arvensis | Field Brome | 4 | 1932 |
| plant | Bromus danthoniae | a flowering plant | 2 | 1938 |
| plant | Bromus grossus | Whiskered Brome | 2 | 1917 |
| plant | Bromus hordeaceus | Soft-brome | 926 | 2024 |
| plant | Bromus hordeaceus subsp. ferronii | Least Soft-brome | 6 | 2015 |
| plant | Bromus hordeaceus subsp. hordeaceus | Common Soft-brome | 1604 | 2021 |
| plant | Bromus hordeaceus subsp. longipedicellatus | a flowering plant | 1 | 2012 |
| plant | Bromus hordeaceus subsp. molliformis | Divergent Soft-brome | 1 | 1984 |
| plant | Bromus hordeaceus subsp. thominei | Sand Soft-brome | 1 | 1927 |
| plant | Bromus hordeaceus x lepidus = B. x pseudothominei | Lesser Soft-brome (hybrid) | 38 | 2001 |
| plant | Bromus interruptus | Interrupted Brome | 3 | 1930 |
| plant | Bromus japonicus | Thunberg's Brome | 3 | 1955 |
| plant | Bromus lepidus | Slender Soft-brome | 17 | 2017 |
| plant | Bromus racemosus | Smooth Brome | 132 | 2021 |
| plant | Bromus racemosus subsp. commutatus | Meadow Brome | 242 | 2021 |
| plant | Bromus secalinus | Rye Brome | 23 | 2016 |
| plant | Bromus squarrosus | Rough Brome | 1 | 1931 |
| plant | Brunnera macrophylla | Great Forget-me-not | 23 | 2023 |
| plant | Bryonia dioica | White Bryony | 1354 | 2023 |
| plant | Bryonia sp. or Tamus sp (unidentified bryony). | a bryony (unidentified) | 317 | 2010 |
| plant | Buddleja | a butterfly-bush (unidentified) | 26 | 2020 |
| plant | Buddleja davidii | Buddleia | 2624 | 2024 |
| plant | Buddleja davidii x globosa = B. x weyeriana | Weyer's Butterfly-bush | 1 | 1990 |
| plant | Buddleja globosa | Orange-ball-tree | 2 | 2011 |
| plant | Buglossoides arvensis | Field Gromwell | 22 | 2002 |
| plant | Bunias erucago | Southern Warty-cabbage | 2 | 1940 |
| plant | Bunias orientalis | Warty Cabbage | 5 | 2014 |
| plant | Buphthalmum speciosum | Yellow Oxeye | 1 | 2019 |
| plant | Bupleurum rotundifolium | Thorow-wax | 1 | 1914 |
| plant | Bupleurum subovatum | False Thorow-wax | 3 | 1988 |
| plant | Bupleurum tenuissimum | Slender Hare's-ear | 78 | 2015 |
| plant | Butomus umbellatus | Flowering Rush | 156 | 2023 |
| plant | Buxus | a Buxus species (unidentified) | 3 | 2018 |
| plant | Buxus balearica | Balearic Box | 2 | 2011 |
| plant | Buxus sempervirens | Box | 335 | 2024 |
| slime mould | Badhamia affinis | a slime mould | 2 | 2008 |
| slime mould | Badhamia macrocarpa | a slime mould | 1 | 1998 |
| slime mould | Badhamia panicea | a slime mould | 4 | 2008 |
| slime mould | Badhamia utricularis | a slime mould | 1 | 2013 |
| slime mould | Brefeldia maxima | a slime mould | 2 | 2008 |
| spider | Ballus chalybeius | a jumping spider | 2 | 2023 |
| spider | Bathyphantes gracilis | a money spider | 49 | 2019 |
| spider | Bathyphantes nigrinus | a money spider | 5 | 1999 |
| spider | Bathyphantes parvulus | a money spider | 3 | 1996 |
| spider | Brigittea latens | a mesh webbed spider | 2 | 1999 |
| springtail | Brachystomella parvula | a springtail (Collembola) | 1 | 2025 |
| stick insect | Bacillus rossius | Corsican Stick-insect | 1 | 2020 |
| tick or mite (acarine) | Bdellidae | a snout mite (unidentified) | 1 | 2015 |
| tick or mite (acarine) | Bryobia | a clover mite (unidentified) | 2 | 2013 |
| tick or mite (acarine) | Bryobia praetiosa | Clover Mite | 2 | 2013 |
| true fly - | Beckerias pannonicus | a big-headed fly | 2 | 2008 |
| true fly - | Beckerina umbrimargo | a scuttle fly | 1 | 2003 |
| true fly - | Bellardia pandia | Bisetose Emerald-bottle | 2 | 2023 |
| true fly - | Bellardia vulgaris | Pale-veined Emerald-bottle | 4 | 2013 |
| true fly - | Beris | a Beris species (unidentified) | 2 | 2023 |
| true fly - | Bibio | a Bibio true fly (unidentified) | 7 | 2023 |
| true fly - | Bibio johannis | Black Gnat | 15 | 2024 |
| true fly - | Bibio lanigerus | a st mark's fly | 5 | 2021 |
| true fly - | Bibio leucopterus | a st mark's fly | 3 | 2023 |
| true fly - | Bibio marci | St Marks Fly | 120 | 2023 |
| true fly - | Bibionidae | Indet. St Marks Fly | 4 | 2023 |
| true fly - | Bibio nigriventris | a st mark's fly | 1 | 1969 |
| true fly - | Bibio pomonae | a st mark's fly | 1 | 1990 |
| true fly - | Bibio varipes | a st mark's fly | 4 | 2022 |
| true fly - | Bibio venosus | a st mark's fly | 2 | 2020 |
| true fly - | Bithia spreta | a parasitic fly | 3 | 2004 |
| true fly - | Bombylius | a bee-fly or bee fly (unidentified) | 20 | 2023 |
| true fly - | Botanophila lobata | a fly | 2 | 2013 |
| true fly - | Botanophila varicolor | a fly | 3 | 2004 |
| true fly - | Brachicoma devia | a flesh fly | 2 | 2003 |
| true fly - | Brachycera | a Brachycera species (unidentified) | 5 | 2023 |
| true fly - | Bradysia | a Bradysia species (unidentified) | 4 | 1997 |
| true fly - | Bradysia aprica | a fly | 2 | 1995 |
| true fly - | Bradysia tilicola | a fly | 1 | 2001 |
| true fly - | Brevicornu | a Brevicornu species (unidentified) | 1 | 2021 |
| true fly - | Brontaea humilis | a muscid fly | 1 | 2001 |
| true fly - bee-fly | Bombylius canescens | Western Bee-fly | 17 | 2024 |
| true fly - bee-fly | Bombylius discolor | Dotted Bee-fly | 66 | 2023 |
| true fly - bee-fly | Bombylius major | Bee-fly | 692 | 2025 |
| true fly - (diptera) | Botanophila brunneilinea | an insect - true fly (Diptera) | 3 | 2013 |
| true fly - (diptera) | Botanophila fugax | an insect - true fly (Diptera) | 15 | 2020 |
| true fly - (diptera) | Botanophila striolata s.str. | an insect - true fly (Diptera) | 10 | 2013 |
| true fly - (diptera) | Bradysia fungicola | a fly | 1 | 2001 |
| true fly - (diptera) | Bradysia giraudii | a fly | 2 | 2008 |
| true fly - (diptera) | Bradysia nitidicollis | an insect - true fly (Diptera) | 1 | 2013 |
| true fly - (diptera) | Bradysia placida | an insect - true fly (Diptera) | 7 | 2021 |
| true fly - (diptera) | Bradysia trivittata | an insect - true fly (Diptera) | 2 | 2020 |
| true fly - hoverfly | Baccha | a Baccha hoverfly (unidentified) | 7 | 2001 |
| true fly - hoverfly | Baccha elongata | a hoverfly | 54 | 2024 |
| true fly - hoverfly | Brachyopa insensilis | a hoverfly | 1 | 1950 |
| true fly - hoverfly | Brachyopa pilosa | a hoverfly | 1 | 1948 |
| true fly - hoverfly | Brachyopa scutellaris | a hoverfly | 5 | 2016 |
| true fly - hoverfly | Brachypalpoides lentus | a hoverfly | 4 | 2015 |
| true fly - hoverfly | Brachypalpus laphriformis | a hoverfly | 7 | 2008 |
| true fly - midge, gnat or mosquito | Boletina basalis | a fungus gnat | 1 | 2000 |
| true fly - midge, gnat or mosquito | Boletina bidenticulata | a fungus gnat | 1 | 1930 |
| true fly - midge, gnat or mosquito | Boletina dubia | a fungus gnat | 1 | 2001 |
| true fly - midge, gnat or mosquito | Boletina gripha | a fungus gnat | 2 | 2021 |
| true fly - midge, gnat or mosquito | Boletina nitida | a fungus gnat | 2 | 2000 |
| true fly - midge, gnat or mosquito | Boletina trivittata | a fungus gnat | 1 | 1998 |
| true fly - midge, gnat or mosquito | Bolitophila cinerea | a fungus gnat | 2 | 2003 |
| true fly - midge, gnat or mosquito | Bolitophila modesta | a fungus gnat | 1 | 2001 |
| true fly - midge, gnat or mosquito | Bolitophila occlusa | a fungus gnat | 1 | 2001 |
| true fly - midge, gnat or mosquito | Bolitophila saundersii | a fungus gnat | 5 | 2003 |
| true fly - midge, gnat or mosquito | Brachycampta alternans | a fungus gnat | 1 | 2001 |
| true fly - midge, gnat or mosquito | Brachycampta grata | a fungus gnat | 1 | 2001 |
| true fly - midge, gnat or mosquito | Brachypeza armata | a fungus gnat | 1 | 1985 |
| true fly - midge, gnat or mosquito | Brevicornu fissicauda | a fungus gnat | 2 | 2001 |
| true fly - midge, gnat or mosquito | Brevicornu griseicolle | a fungus gnat | 8 | 2003 |
| true fly - midge, gnat or mosquito | Brevicornu sericoma | a fungus gnat | 9 | 2021 |
| true fly - midge, gnat or mosquito | Bryophaenocladius vernalis | a non-biting midge | 1 | 2020 |
| true fly - robber, empid or dolichopid fly | Bicellaria nigra | a dance fly | 2 | 2021 |
| true fly - robber, empid or dolichopid fly | Bicellaria vana | a dance fly | 16 | 2008 |
| true fly - soldier or snipe fly | Beris chalybata | Murky-legged Black Legionnaire | 24 | 2022 |
| true fly - soldier or snipe fly | Beris clavipes | Scarce Orange Legionnaire | 6 | 2018 |
| true fly - soldier or snipe fly | Beris fuscipes | Short-horned Black Legionnaire | 2 | 2000 |
| true fly - soldier or snipe fly | Beris geniculata | Long-horned Black Legionnaire | 10 | 2021 |
| true fly - soldier or snipe fly | Beris morrisii | Yellow-legged Black Legionnaire | 15 | 2020 |
| true fly - soldier or snipe fly | Beris vallata | Common Orange Legionnaire | 63 | 2023 |
| tunicate (urochordata) | Botrylloides leachii | a tunicate (Urochordata) | 1 | 2016 |
| tunicate (urochordata) | Botryllus schlosseri | Star Squirt | 2 | 1972 |
| woodlouse | Buddelundiella cataractae | a woodlouse | 1 | 2015 |
| worm | Bimastos eiseni | an earthworm | 24 | 2020 |
| worm | Bimastos rubidus | Bank Worm | 26 | 2020 |