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Using FSC Publication"Simple Key to Caddis Larvae" by Ian Wallace I wondered if this might be in the Limnephilus group but further information re type of habitat found (whether salt marsh peat bog etc.and some idea of size Ie overal length might help with a more specific ID I may be on completely the wrong track as my ID is based entirely on th key in this book!
It was found in a freshwater lake and was at least 3cm in length
Simon Woodhouse, Holt Hall Environmental and Outdoor Learning Centre
Given the extra info I would go for Limnephilus Lunatus
I also think that it is a member of the family Phyrganeidae. The prothorax has a large sclerite whilst the mesothorax appears to be membranous and lacking sclerites. In the limnephilidae the mesothorax would have large mesonotal plates and I cannot see these. The markings on the head are very typical of Phryganeids and look very much like those of Phryganea bipunctata.
Having re checked my reference work I agree head markings are those of Phrynaneidae
Lat/Lng: 52.9160044, 1.086481
OS grid ref: TG076398