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Thanks for that. The abdomen is green, so I think this is a female.
Chinery description, gives dark wings & yellowish rear tarsi, which the pictures exhibit, for Chloromyia speciosa.
That raises an interesting possibility - C. speciosa has never been recorded in Britain so far as I am aware, but it is in France and it is very similar-looking to C. formosa, although it should have yellow tarsi on both the hind and middle legs.
It can be difficult to judge the colour of the tarsi in photos of C. formosa, as they have yellow hairs over a blackish ground colour.
Personally I think the leg colour that we can see here is closer to C. formosa than C. speciosa, with the apparent yellow being a result of the yellow hairs catching the light, but thanks for raising speciosa as a possibility, I'll look out for more information on it. And I'll certainly keep a closer eye on the leg colour of any C. formosa I come across in future!
Entomologist and biological recorder
Thanks for the info.
Lat/Lng: 51.4337, -2.7624
OS grid ref: ST470707