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Hello Rupert,

a Syrphus female. Doesn't seem to have hairy eyes, so not S. torvus. If you have a photo, which shows the hind femora colour, we can tell whether it is S. ribesii (femora nearly completely yellow) or S. vitripennis (femora mostly dark). From the general expression I'd vote for ribesii.

Parasyrphus are smaller and predominantly spring species.