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The hind tibia is 2/3 yellow, so looks good for pendulus.
My Flickr photos...
Thank you, ophrys. iSpot trawling and a copy of Gilbert's 'Hoverflies', found in a corner of Amazon, leads to success! The wine is flowing as we speak. Now, some Eristalis to sort out...
Lat/Lng: 55.78898, -4.20168
OS grid ref: NS620572