Silver-washed Fritillary (Argynnis paphia)
This is a woodland dweller, though like several other Fritillaries, it too requires Violets for the caterpillars. The strong-flying adults, which are on the wing from June to September, often feed at Brambles.
A few females have a much darker greeny colouration and seem to favour more shaded woodland.
Images L-R: male; female; underside; below - female dark variety Valezina
Flight Period: June - September