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I have keyed this out as Leucostoma simplex, which seems very unlikely, given its status in the UK. Although I have used Belshaw to confirm it is a Tachinid, I am wondering if I have gone wrong and it is actually a Rhinophorid. The photo of the subscutellum below shows a brown area between the scutellum and subscutellum, but this appears to be a flat area on the top part of the subscutellum, rather than a joining membrane.

This is a small fly, about 5mm in length. It has very large eyes.

Any help gratefully received (one for Chris Raper me-thinks).