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Re Dexia vacua, in Chris's absence I looked it up on his website (http://tachinidae...), where he quotes Belshaw as saying:
"British distribution: S.England, Midlands (Hereford and Cheshire), Wales, N.England and N.Scotland. Flight period: late July and August (at least 50 records)."

However, Chris seems to have just three records on his website database, so I'm sure he will welcome another :D

Martin