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I think it is one of the genus Chrysops, but not certain enough to add it formally.
Thanks very much for the id given.
I had no idea it was a Horsefly, although I have been bitten by one before.
It actually sat on my flashgun at one point millimetres from my face!!
One landed on my camera bag, then casually walked across it onto my hand, carefully selected my ring finger; then started drilling.
"Ouch", I said...
Lat/Lng: 52.0, 1.1
OS grid ref: TM1544