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Difficult to judge the size here, so not sure if it is a queen or a worker.
As I understand it, current advice from BWARS (Bees, Wasps and Ants Recording Society) is that it is not possible to safely distinguish workers of Bombus terrestris and B. lucorum, and the situation has been further confused by the discovery of Bombus cryptarum, which very similar to B. lucorum. The species are distinct in their DNA, but I don't think reliable external characters have been found yet.
Could well be Bombus lucorum but I couldn't be 100% certain of it.
Entomologist and biological recorder
Lat/Lng: 51.7, -2.6
OS grid ref: SO6208