If you find that you need to have the boiler repaired several times a year, it is a good idea to buy a new boiler. Normally, you want to inspect new boilers as soon as they are under warranty. If your current boiler is broken, you can request that the boiler be completely reinstalled.
In the UK from time to time, there are various schemes available to help towards funding a new boiler. The UK Government funding for this scheme is limited, so the eligibility criteria is quite a bit strict. So, in order to qualify, you'll need to receive at least one benefit.