Thanks alot for that info. I will get the TC changed and the boiler serviced as matter of course i think and thanks for the info on the seal i will look at that as well. Guru you are right about the boiler being simple, one of the engineers said it was simple and even my relatively untrained eye...
My boiler has a problem in that the pilot light goes out. It will often stay on long enough to go through a few cycles over a couple of days then it goes out, often accompanied with a click noise from the boiler. On other days it needs to be relit before each programmed cycle begins.
The flame...