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The head is slightly distorted, probably because it hasn't been fully dehydrated prior to mounting. On the other hand, the genitalia preparation and the wing look very nice!
Of the described species, this looks most similar to P. austriacus Vaillant, 1974 and P. kowarzi Jezek, 1997; both of which may feasibly occur in the UK. However, I do very rarely put names on Philosepedon specimens because the taxonomy is a mess and nobody really knows anything about character variability...