Oedemera nobilis. I don’t know how it came by the ridiculous name of “Swollen-thighed Beetle” I would have called it the “Swept-elytra Beetle” or something more descriptive. The female hasn’t got swollen thighs.
And it is the elytra and not the thighs that identify this animal, the open and pointed wing cases. Technically she should be green but this one is getting on a bit (Just like me, she used to be green)