One of the "6 common bumblebees" of the UK (there are more than 6 spp of bumblebee here, but the others are much rarer). The red-tailed bumblebee lives underground in colonies ranging from sub-100 bees to over 200. I watched this one feed at this cluster of Spanish bluebells for a bit, then she landed on the leaf litter and looked to be brushing pollen off her legs. This bee species is very similar to the red-shanked carder bee, Bombus ruderarius, but distinguished by having black pollen baskets (instead of orange) and lacking a "hook" on the hind legs.
Widespread, needs flowers that can support it as it has quite a short tongue for a bee. Commonly found around walls and dried up dykes, as it is easy to burrow under these.
I watched her feed at these bluebells for a while. Guess she got covered in pollen because afterwards she spent a long time scraping it away... must be a nuisance to bees! Spotted on the University of Essex campus grounds.