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Small black fly found on 26 Aug 2014 on bushes near a stream at Martlesham, East Suffolk, TM252473.
I keyed this as Borophaga incrassata using the keys to British Phoridae in RES Vol 10.6 Scuttle Flies (RHL Disney, 1983).
I would appreciate a second opinion on the ID.
Is it possible to tell the sex of this specimen from the following photos?

Best wishes,
Martin