A common hoverfly, at the moment, at wood edges and by hedgerows, fond of basking in prominent positions, but flighty.
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seem to be paler on middle segments, this is probably C. albitarsis/ranunculi
I think that that is a trick of the light, to be honest, though I can see what you mean. I have reduced the ID to Cheilosia only, anyway, just in case. When I look at the abdominal hairs, they do seem rather too pale for variabilis, at the margins.
The place where I took this does have both albitarsis and ranunculi, so better to be safe. Today was the first day that albitarsis have been around, whereas variabilis has been around for a couple of weeks.
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Lat/Lng: 53.8, -0.9
OS grid ref: SE7844