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What are your reasons for plumping for Zygaena trifolii? Given the location I would suggest that Zygaena lonicerae, the narrow-bordered five-spot burnet is more likely and certainly cannot be ruled out from the picture. I think your best bet is to search for caterpillars next year.
Part in jest because i keep getting it wrong and part because of the flight period... I should know better by now really, hence putting the Genus only first!
Lat/Lng: 54.19237, -3.29465
OS grid ref: SD156781