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B. terrestris or lucorum complex. Not a cuckoo.
I did wonder that it wasn't a cuckoo bee, but a friend convinced me it was! Thank you!
I am puzzled as to why you think the colour of its hind legs (always black in bumblebees) and wing edges would be any help at all. This cannot be identified to species - it is probably terrestris, but that cannot always be separated from the lucorum complex. The ID should be "Bombus", no species.
Yes sorry got that wrong. A knowledgeable friend was telling me that hind legs (not the colour of them) are used to tell the difference between social bees and cuckoo bees
Lat/Lng: 50.7, -2.0
OS grid ref: SZ0199