Hi Simon and welcome
Beekeeping, cameras and fishing tackle all have in common the persistent nagging doubt that whatever you have, you would surely do even better with something slightly different! It may help explain the unlikely number of fishing rods I own the last time I bothered to count..
Bees attempt to swarm to reproduce, it’s natural and is not a problem if you manage it ok. Of course there are plenty of sources of queens that claim the world for their products, but it is usually not a one-off purchase policy as you may not be able to breed true from them and their daughters may prove problematic. If that is a route you want to try, give it a go.
I had one queen I kept for five years as an experiment once but generally I am not interested in keeping them over two years as their fecundity naturally declines with age. Attempting to swarm does not need to be an issue as long as your management means you don’t actually lose the workers in a swarm. Over time you can reduce swarminess but it is only one desirable characteristic - temper, honey production, laying rate and disease resistance are amongst others.
There are other views but mine is learning to manage swarming is a critical part of what makes a beekeeper and is part of the challenge. Learn to enjoy it and use the opportunities it provides, not least the excitement of entirely natural queen rearing.
It is possible your bees are unusually swarmy but more likely they are fairly typical. Learn to clip queens and it will make the swarming season a heap easier. Find out how good beekeepers around you manage swarming and compare it with your chosen method. If all you have done is the Pagden as taught on most beginners courses, try some alternative methods as well.