The male of Oedemera nobilis, as in most Oedemera species, possesses the hind femora very swollen, whereas, in females, the femora are thin; the elytra are strongly narrowed towards the apexes, not hiding the membranous hind wings. It is bright green, frequently with a golden or coppery shine; some individuals are blue or violaceous.
It can only be confused with Oedemera flavipes (which does not live in the British Isles), from which it differs by its colour and the long white pubescence on the head, pronotum and hind tibiae of males.
My profile is visible on the leg of the second image.
Seen in Osterley Park in July 2020