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Hi ole, Jürgen & Paul,
I think I see three dorscocentrals, that with the white wing spot but lacking a dark outer wing border should exclude Trixoscelis marginella. There are no other Trixoscelis species in North-West Europe to my knowledge that have these features.
Maybe it is indeed a Ephydridae, like Jürgen suggested, what do you think, Paul?
Kind regards,
Ectemnius