Lots of these around yesterday - c8-10mm
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I agree that this is a species in genus Arge, but there are several to choose from. Arge pagana has black legs so I don't think it is that. I would guess at Arge cyanocrocea, but I don't have my books to hand at the moment so can't check.
Entomologist and biological recorder
Oops I have just read your comments Martin as I came into the thread via the carousel on Rose Sawfly this one stuck out definitely not the Rose Sawfly
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Many Thanks for your observations!
Lat/Lng: 53.0, -1.5
OS grid ref: SK3649