Swarming is the honey bee's way of multiplying, basically a strong healthy colony will split in half. The bees will raise a new queen and half the bees will leave with the old queen to set up home elsewhere. It's quite a spectacular thing to see and hear thousands of bees flying together.
I've seen a few reports online about swarms starting to leave so over the next few months you may see a swarm flying or collecting on a branch, If you do, keep well back, don't hit them with a stick or throw stones at them and remember that they will be moving on to their permanent home soon, they just haven't found it yet.
you can go onto https://www.bbka.org.uk/swarm, enter your postcode and it will give you contact details for a local beekeeper that is on the 'swarm list'
You could call a pest controller, they won't kill the swarm and often will either collect the swarm themselves or call in a friendly beekeeper from the swarm list above.



