Presumably a micromoth, forewing about 10-12mm though this is only a retrospective guesstimate.
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Thanks for pointing to Carpets - perhaps it is a faded Common Marbled Carpet (C. truncata) or Dark Marbled Carpet (C. citrata)?
No expert haha, now I've looked at into Green Carpet I know i'm probably wrong. Marbled Carpet seems likely!
Unfortunately I don't have a photo of the underside, and it was released. I've added the only other photo which is less contrasty and the 'right way' up. Of the two I think I would lean towards C.truncata given the angle that the outer edge of the central forewing cross-band approaches the central projection from the leading edge. But we shall never know for certain with this individual.
lean towards truncata but I think this one will just have to stay as the aggregate.
Lat/Lng: 53.2, -1.8
OS grid ref: SK1473