No idea what this is but I spotted it whilst prowling - camera in hand - in the garden this afternoon. UPDATE: Thanks to @haskar, I now know that this is a Cercopis Vulnerata - aka a red and black frog hopper.
Cercopis vulnerata (also known as the black-and-red froghopper or red-and-black froghopper) is a species of froghopper in the family Cercopidae...Great close up.