It’s a Potter Flower Bee or Anthophora retusa
This bee has declined so rapidly and severely that it is now only found at a handful of sites on South East coasts since 1990. Also, the ‘cuckoo’ bee that depends on this bee for its survival is now thought extinct in the UK.
I feel that I want to do much more work about this little creature, I just want to make more artwork about it, in celebration of it. And I really recommend that you head over to Steven Falk’s flickr page to see his photos of this darling creature – it’s got beautiful legs: https://www.flickr.com/photos/63075200@N07/sets/72157633009709801/