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it could be deliberately planted up with Anemone blanda? (I am not sure what the differences are however, but this looks exactly like my garden plantings)
I think perhaps there are too many petals for A. nemorosa so would be happy with A. blanda.
I have a feeling this one may be Anemone apennina though the main differences between this and A. blanda are not visible in this picture.
Lat/Lng: 50.9141, 0.48822
OS grid ref: TQ750156