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Looks like a dark example of S. stercoraria
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Is Colyer's Flies of Brit. Isles '68 edition any good, or do you know of something more recent? It seems a bit old. I imagine it's not really possible to get anything particularly comprehensive for British diptera and that it's spread across various specialist works?
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Yes, it is difficult to get all the details you need in one book! A few families are well covered by accessible guides, like British Hoverflies and British Soldierflies, for example. Beyond that it all gets a bit complicated and you move on to online guides partly, like Stuart Ball's Draft Key to the Scathophagidae. That and some other useful guides can be accessed by joining Dipterist's Forum, which is an outstanding resource on flies and thoroughly to be recommended.
Become a paid-up member there and you get access to the test keys and all sorts of great advice.
Lat/Lng: 51.5557, -0.0246
OS grid ref: TQ370859