Small black fly c 6mm.
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Thanks David. That vein gets a bit lost in the iridescence and I wasn't sure if it reached the wing margin and if all else is right for Muscidae, then I'm sure you're right. I thought is was one or the other!
Nick Upton, naturalist and photographer.
Lat/Lng: 51.4086, -2.2627
OS grid ref: ST818677