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this one is from Glos, and I've assumed it's the same species as this one from herts http://www.diptera.info/forum/viewthread.php?thread_id=62788 - where the day before I caught a Lydina, which has flattened antennae 3 (in profile) and what looks like a tiny petiole. Neither of these have it and the antennae are thin.

here's a picture from the front, and one showing more of a profile, and the best I can do on the wing, which seems to show just a few hairs

cheers