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The photos are very good but there are a few small female Andrenas that could be considered here. It would help knowing where in the UK the bee was photographed. The further south you go the more micro-andrenas there are to consider, and the bigger headchae you have.
This looks too big to be one of the commoner Micrandrenas. This one could be the size of A. chrysosceles or A. proxima
It was photographed in Nailsea, North Somerset
Given where you are, it could be either. I tend towards A. proxima but this is only a tentative suggestion and certainly is nowhere near good enough to make a record out of this