On a dandelion
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There are >60 species of Andrena in Britain, there is no satisfactory key to the genus, and it is not generally possible to identify them (especially males, but also the females) from photographs. This one *might* be haemorrhoa, but I can't see any feature that would make it definitely this species.
It is possible to get a guide to the identity of some oligolectic (pollen-specialist) females from the pollen they collect, but males do not specialise in the same way so the forage plant is no guide at all.
recording wildlife with The Recorder's Year on www.hbrg.org.uk/TRY.html.
Seems like a key is desperately needed, we have a lot of information on overseas biodiversity but seem to be lacking here at home. I think that needs to change
Thanks for all the comments, I had no idea there were so many Andrena species
With Best Wishes
A key is in preparation as we converse in the ether, but it will not be easy to use, and before you will ever be able to do field ID of any more than a few solitaries, a lot of work on specimens and a few years of practice and learning will be required.
Lat/Lng: 52.2, -3.4
OS grid ref: SO0460