Not sure what this is. Looks like a bee, possibly a fly, is it a beefly? If so, what species please?
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It's a hoverfly, one of the drone fly mimics. It's probably tenax, as the abdomen is broad and the hind tibia appears dark and thick. Difficult to be certain of that, though.
My Flickr photos...
Cheers, I think you're right :)
Lat/Lng: 52.0376, 1.2189
OS grid ref: TM208425