Harmonia axyridis: https://influentialpoints.com/biocontrol/Harmonia_axyridis_harlequin_ladybird.htm
British slugs: https://www.naturespot.org.uk/sites/default/files/downloads/Identifying%20British%20Slugs%20%202012%20version%201.pdf
Bees - Steven Falk: https://www.flickr.com/photos/63075200@N07/collections/72157631518508520/
Syrphidea - Steven Falk: https://www.flickr.com/photos/63075200@N07/collections/72157629600153789/
Insects - Steven Falk: https://www.flickr.com/photos/63075200@N07/collections/72157629222209764/
Ichneumonids: https://www.naturespot.org.uk/sites/default/files/downloads/british-ichneumonid-wasps-id-guide.pdf
White butterflies: https://www.naturespot.org.uk/wildlifeguide/white-butterflies
Ray eggcases: https://www.sharktrust.org/Handlers/Download.ashx?IDMF=c8751407-737a-4013-852d-42f8e6b751b6, https://marinedimensions.ie/how-to-identify-a-mermaids-purse/, https://www.sharktrust.org/pages/faqs/category/eggcases-of-british-isles-nw-europe

NHM Beginner's Guides seaweed, bees etc): https://www.nhm.ac.uk/take-part/identify-nature.html

Sphaerophoria: https://www.inaturalist.org/posts/84320-identifying-sphaerophoria-in-the-uk-from-photos

Collins Wild Flower Guide pp. 208-11

Brassica rapa, Turnip: dense inflorescence, buds overtopping open flowers, sepals erect
Brassica napus, Rape: dense inflorescence, flowers overtopping buds
Rhampospermum nigrum, Brasssica nigra, Black Mustard: all leaves stalked

Sinapis alba, White Mustard: all leaves stalked
Rhamphospermum arvense, Sinapis arvensis, Charlock: lower leaves stalked, upper leaves sessile - https://www.naturespot.org.uk/species/charlock

Hirschfeldia incana, Hoary Mustard: stiff white hairs on lower part of stem
Rapistrum rugosum, Bastard Cabbage: stems stiffly hairy, dark green leaves - https://www.naturespot.org.uk/node/253992
Rapanus raphanistrum, Wild Radish: petals may be white, dark veins on petals

https://www.naturespot.org.uk/family/brassicaceae
https://www.naturespot.org.uk/family/brassicaceae?page=1

NB seeds