I would say so. The long boomerang-shaped distiphallus is fairly distinctive in this genus.
On its left wing, the anal vein clearly runs to the wing margin, so I'd say this is Anthomyiidae - it has the coloration of Hydrophoria or Hylemya, but I can't see whether the arista is plumose (which would help to confirm it as one of these two genera).
The morphology of the head (and the time of year) points to one of the Leucophora species (Anthomyiidae). They are nest parasites of aculeates, so you may see some interaction between them and their hosts.
two pairs of presutural acrostichals, orange abdomen, relatively broad presutural dark stripes - all add up to Phaonia subventa (which is fairly abundant at this time of year)
Have you tried Martin Drake, Ray? Have a look at the Recording Scheme page on this site via the Resources menu (or use this page address: https://dipterists.org.uk/empid-allies-scheme/home). Notice though that in the comments he says an atlas will have to await publication of his monograph on the Family so I don't know how easy it would be to extract a list of records for a particular County. Good luck.
I think you'll get more response on the UK Hoverflies Recording Scheme group page of Facebook, Nick. https://www.facebook.com/groups/609272232450940
Thanks Colin, I will try that, it could be Eupodes corollae but needed to be in the net for confirmation.
We know that for some Sciomyzidae, the eggs and larvae of adults fed on a high protein diet develop faster (and thus have a competitive advantage) over eggs and larvae from adults on a low protein diet. (Beaver, 1989 cited in Knutson and Vala, 2011 – Biology of snail-killing Sciomyzidae flies.) It would therefore seem likely that adult females will seek out protein-rich sources of food, such as carrion, and the males will too if it improves their chances of meeting a female.