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I was thinking either Green Dock Beetle (Gastrophysa viridula) or Mint Leaf Beetle (Chrysolina herbacea). How would you identify between the two?
I also considered Mint leaf beetle but, as I have observed Green dock beetle and not (knowingly) seen Mint leaf beetle, I opted for it as an id to get the debate going. Looking at Chinery (the only beetle reference I have) the front of the pronotum is more rounded and the legs appear to be darker in Green dock beetle. Where you found it will also give a clue.
Hopefully an expert will now let us know how to separate the two (if it is possible from a photograph).
Lat/Lng: 50.1711, -5.1236
OS grid ref: SW770347