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Many thanks, Jeremy. Yes, I read it was on the RDB2 list until recently, but it is either becoming more common (maybe a warmer climate favours rotting wood…) or observers are becoming more alert about where and when to look for it. I was actually out photographing fungi (with macro lenses/flash kit at the ready!), but got heavily distracted by one tree base which as well as a big bracket fungus had 2 kinds of wasp coming and going (Ectemnius cephalotes, a rotten wood specialist) and a smaller one yet to be identified and what I think is a Tachinid sniffing around, yet to be Idd and only after 15 mnins of photographing that lot did I notice some wing fanning and the odd 3some mating trio of these flies and switched my attention to them. I've seen some tropical flies lekking/competing a bit like this but never in the UK before. Now working on another little orange fly on a toadstool. Heleomyzidae I think...