on umbellifers in damp meadow-scrub
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Not Cheilosia, as the face is flat and hairy, if you look closely. I'll let you work it out for yourself, rather than adding an ID...!
Edit: Since agreements are starting, I shall add an ID!
My Flickr photos...
Lat/Lng: 51.95074, -2.04823
OS grid ref: SO967280