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Its definitely a caddisfly and I think it looks pretty good for one of the Limnephilus species. As its going to be a very tricky one (if not impossible) to bring to species, maybe an ID of Trichoptera would have sufficed but I think enough detail and colouration is available to say its a member of one of the Limnephilidae groups. As stated above the colouration would be correct for a number of different species including some Limnephilus and both Stenophylax.
Thanks. You pointed me in the direction of an order I had no idea were so numerous and varied. I'd guess that the Buff-bellied pipit did dissect the genitalia but then ate them ;o)
Your'e absolutely right Inopinatus. The way the wings were contorted it wasnt immediately clear to me which was forewing and which was hindwing but the presence of the lunar crescent sorts that out. Well spotted!
Lat/Lng: 51.4815, -0.5416
OS grid ref: TQ013768
by the waters edge