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Many thanks Paul. Can't believe how varied Syrphidae are and it didn't hang around long enough to get many clear shots. Will re-post this in the Syrphid section and see if anyone can say more precisely what it is. Pipiza bimaculata looks the closest form online photos based on the extent of white markings on abdomens of males and wing pattering, but I don't know how reliable/variable these characters are.