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With thanks to Paul Beuk and Chris Raper, presumably! ;)
My Flickr photos...
Steven Falk has kindly commented on this image on Dipterists Forum. here's what he says:
"The Pollenia is angustigenis - the eye orbits are very closely approximated at the top (most other similiar Pollenia have the orbits slightly more separated by the black 'interfrontalia' plus the photo clearly shows just a single antero-dorsal bristle on the mid tibia as opposed to 2-3 bristles."
Lat/Lng: 52.1, -1.6
OS grid ref: SP3155