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I think this is likely tohe one of the
Helesus spp, what the angelers cakll a Caperer. I'm not sure though.
I would probably go with the species Limnephilus decipiens or marmoratus but which one? not confident enough on basis of this particular photograph. It illustrates one of the problems with photographing many caddis adults in that they have translucent wings and the pattern gets lost in some views.
Ian Wallace, UK Trichoptera Recording Scheme
Lat/Lng: 52.08925, 0.05532
OS grid ref: TL409454