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I have added some more images of this bee. It does look like a cuckoo bee, with darkened wings, hairless patches on the abdomen and few hairs on hte hind legs. The tibia are lighter in colour. I found it on a lavendar border visited by several other bumblebee species.
Lat/Lng: 52.6067, -1.0926
OS grid ref: SK615013
Lavender border with plenty of other bees visiting