Bumblebees in a West Sussex garden today

 

Buff-tailed bumblebees mating.  The male is much smaller than the queen.

See also https://www.bumblebeeconservation.org/learn-about-bumblebees/species-guide/buff-tailed-bumblebee/

Red-tailed bumblebee 

https://www.bumblebeeconservation.org/learn-about-bumblebees/species-guide/red-tailed-bumblebee/

Buff-tailed worker collecting pollen on Yellow rattle flowers.