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Many thanks. The latter suggestion was certainly the impression I had at the time
It is a male with antennae that long.
Once you get your eye in it is easy to spot the males of all wasps and hornets by their long antennae, slightly out-curved at the tip. Great fun catching them and holding them in bare fingers, to the amazement of children. You must choose whether you then let on that males can't sting. You have to be fairly confident in your sex determination for this to work well. Even stingless, the males still prod at you with their tail-tip. Can be disconcerting.
Many thanks, Richard - and particularly for your Ispot reccomendation!
Lat/Lng: 51.4, -0.03
OS grid ref: TQ371686