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strikingly similar to a specimen I collected a few days ago
Edit: wing/body-length looks different, plus the way the wings are held. Perhaps you could try it on Dipterists forum and see if it can be narrowed down
latest pics and diptera videos
Thanks for the comments which I shall follow up.
Dipterists Forum has come up with a female
Cordilura albipes (Scathophagidae).
yes, I didn't notice the side of the thorax is pale in that way because of the angle (image 1). Here's my male from the autumn:
Add it as an id with the usual acknowledgement, I'm certainly convinced
Lat/Lng: 51.4337, -2.7624
OS grid ref: ST470707