Small hoverfly on Lesser Celandine...species difficult without a closer look.
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Probably N. meticulosa, as a clear-winged species with extensively yellow legs and a constricted waist. The species is common at this location.
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After checking for right-angled outer cross-veins - gradually visible on both wings if you stare at it long enough - and noting the hind tibia's black ring, I looked at those yellow legs and it seemed a match for meticulosa. I thought you'd only put forward a genus so I wondered if you thought it might be tenur or geniculata, but found nothing to account for that much yellow.
Now I've just seen your note, so wonder that you're not more certain - hind femur strongly yellow at apex etc?
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Once you've been looking at hoverflies for a while, you realise the amount of variation within species and the futility of trying to be too accurate with species ID from a photo. The amount of infuscation on the wings is variable, for example. A photo can distort the true colour of legs quite dramatically, too; I would never be too sure of what colour the middle tibiae are on this fly, for example. For accurate ID of a Neoascia, it is better to have them under the scope, to check the chitin bridge behind the rear coxae, and to see the orientation of any spots...etc, just to be sure.
Thanks for your agreement.
Lat/Lng: 53.8, -0.9
OS grid ref: SE7644