Large black bee, 15mm, hairy thorax, white spots on legs and side of abdomen.
No interactions present.
Just because a bee is "slow moving" does not mean it is or is not a cuckoo bee species. It was probably a little cold, cuckoo bee species can move just as fast as other bee species if the temperatures are favorable.
Tachinid Recording Scheme
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This one is a male, a good comparison with the female at:
Entomologist and biological recorder
Lat/Lng: 52.060736693519, -0.71686327457428
OS grid ref: SP880410