Bumblebees. I've had a decent variety this year, so here are a selection
Buff-tailed bumblebee, Bombus terrestris.
White-tailed bumblebee, B. leucorum. (very hard to separate from the previous species in the field, but the yellow bands tend to be lemon yellow instead of orangey)
Red-tailed bumblebee, B. lapidarius.
Common Carder bee, B. pascuorum. (Always tawny brown all over)
Tree bumblebee, B. hypnorum. (Brown thorax, black abdomen, with a white tail. A recent addition to the UK bumblebee list, but rapidly spreaing)
Field cuckoo bumblebee, B. campestris. (Commonest of the cuckoo bumblebees, which are nest parasites of other bumblebees. They are less hairy and look shiny, and wings are often dusky rather than clear, but they often resemble their host species so can be tricky to identify)
Southern Cuckoo bumblebee, B. vestalis.
This is by no means a comprehensive list.