All bees are beneficial garden pollinators, they are not normally aggressive and if left alone are unlikely to sting. We recommend that no action is taken against bees unless you really consider the location of their nest to be a danger to you or your family.
Dealing with the problem yourself
At certain times of year colonies of honey bees may leave a nearby hive and alight on a trees or lamp post etc. If left alone they will often move on of their own accord. You could also try contacting the British Beekeepers Association to see if a local beekeeper will come and capture and remove a colony. Only on very rare occasions will it necessary to destroy the colony.
There are a large number of small solitary bees that also frequent domestic gardens e.g. masonary bees, mining bees etc. These nest above or below ground, sometimes making holes in the pointing and brickwork. They are all harmless, do very little damage, and should be left alone.
If you have a bumble bee nest which you believe to be a safety risk and do decide to treat it yourself, suitable products are available from supermarkets, DIY shops and garden centres etc. You must first locate the entrance to the nest. Following the flight pattern of returning bees may help. Treatment should be carried out very early or late in the day when activity is at a minimum (the evening is preferable).
Apply the insecticide to the entrance of the nest, or directly on to the nest if it is visible retreat away from the nest quickly and keep well away from the treated nest for at least 24 hours
Consider the risks carefully before attempting a treatment yourself, you may be better seeking professional help.