Shiny-vented Sharp-tail Bee
A Visual Guide for the Identification of British Coelioxys Bees' I was able to get the ID to species level. Sharp-tail Bees are host parasites, the female using its sharp 'tail' to pierce the cells of Megachile Leaf-cutter Bees to lay its eggs in them.
|The shape of the female abdomen tip, viewed from underneath, was a clincher|
|I also studied the facial setae characteristics|