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The hind wing marking in P. purpuralis are off-white
I may well be wrong - it may be enough for those with more experience to confirm. At least on my screen, it gives the impression of a much paler, more washed-out colour on the hindwing.
That would be the effect of the flash
Lat/Lng: 50.721, -1.8377
OS grid ref: SZ115912