If you see a cluster of bees similar to the pictures above it is likely that you have a swarm; don't worry they are usually docile. Simply stop anyone getting too close and contact your local beekeeper by clicking the link below. Removal of the bees is usually free of charge, although a donation to the local beekeeping association would be gratefully received. If possible please send a photograph of the swarm to the beekeeper.
The link below will take you to the British Beekeepers Association website, with further steps to identify the type of bees. Once you're sure they're honey bees you will be able to find a local beekeeper who will collect swarms, by typing in your postcode on the swarm locator map.