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I agree that Bombus hortorum is the most likely species, although I'd find it difficult to rule out the rarer Bombus ruderatus.
Entomologist and biological recorder
Could this also be the cuckoo species B. barbutellus?
Rob, that is another possibility. Isabel's bee does seem to have a long face (which fits hortorum more than barbutellus), and I thought I could see a bit of shiny surface on the hind tibia (which suggests a 'normal' bumblebee rather than a cuckoo), but I'm not 100% confident so perhaps we are better sticking to just Bombus sp. for this one.
On further contemplation the thorax is probably too hairy for a cuckoo bee, but agreed - Bombus spp. is the best option for this!
Lat/Lng: 52.1, -0.8
OS grid ref: SP8453