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Thsnks very mcuh, Xylo (and Tony). That seems to fit, from what I can see.
I have just looked at the British Scathophagidae web site, and a quote from the page on identifying the family in general is as follows:
"It can be quite tricky to decide when you are dealing with a Scathophagid since, in most keys, this family drops out at the end of the key to Calyptrate families if it is not a Muscid, Fanniid or Anthomyiid. They tend to be distinguished by the lack of features that characterise these families, rather than by anything very definite that is unique to the Scathophagidae. In general appearance they can easily be confused with Anthomyiidae and....."
That's about it! But it would have been better if I had got proper images of the head, so it was a bit more obvious it was a Scathophagidae. :)

Nigel.