Don't know if the boiler is finally going. It's started making a lot of noise when it's on. It used to only make the noise when the radiators were on and then was quiet when the hot water was on (or when both were on). I believe this was due to the cooling effect in the boiler of the hot water system (after asking this question here sometime in the last year). The whole system was cleaned out and inhibitor put in earlier on but maybe it's getting time to replace it. However apart form the noise the radiators are warm and the waters hot so I don't know.
What do you think? Is the noise a sign of it being on it's last legs?