First thought this was an ichneumon wasp but I'm thinking a hoverfly now.
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Thanks for the last few IDs. I have had Baccha elongata pointed out to me before so should have remembered - although I don't remember it being quite so swollen at the end of the abdomen. Is that variable?
Biodiversity Officer - Shropshire
I must admit, that's why I only put it as a 'Might Be This'. The in-flight shot shows a very narrow 'waist' though, and I'm fairly sure this is the only species that has that feature to such a degree. I think the thicker end to the abdomen is just because it is a female and needs the extra room for egg production. (The females of many hoverfly species can be indentified because their eyes don't touch on the top of the head.) The example from squirrel in the 'Other observations' section is a male.
Lat/Lng: 52.7, -2.8
OS grid ref: SJ4913