White-tailed bumblebees

My beech hedge is alive with these - does anyone know what they might be doing on it as it doesn't seem a likely food plant???

Very happy that they are in the garden though

What you have there is a Bombus terrestris: The buff-tailed bumblebee or large earth bumblebee is one of the most numerous bumblebee species in Europe. They are characterized by their white-ended abdomens. The queen is 2–2.7 cm long, while the workers are 1½–2 cm.

Such bees can navigate their way back to the nest from a distance as far away as 13 kilometres (8.1 mi), although most forage within 5km from their nest.