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Looks like a male Gatekeeper (or Hedge Brown) Pyronia tithonus. You can see the conspicuous dark scent band across the forewing. The black spot on the front of the forewing usually has two small white pupils in but sometimes (as here) only one.
Agree with above. You can see the two dots on the far wing, and very faintly on the near wing when viewed full size.
Lat/Lng: 51.0, -0.1
OS grid ref: TQ3431