Hairy bee, 20mm long with broad body. Orange band on thorax, none on abdomen. White tail.
No interactions present.
Looks very much like B. lucorum
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Bombus lucorum would have a yellow band at the top of the abdomen, this one is plain black, so B.lucorum is ruled out.
B.bohemicus certainly does turn up in southern England so can't be discounted, but it is not a particularly common species.
B.sylvestris is a common species in southern England, though I find the males in much much higher numbers than the queens.
Tachinid Recording Scheme
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Lat/Lng: 52.060736693519, -0.71686327457428
OS grid ref: SP880410