Question Author
Looks like these so called "engineers" are, Hard@it. It makes you despair, doesn't it, that they can give all this bullsh!t cos they know that you don't know any different. I don't know the first thing about boilers, and rely on the 'professionals' to guide me. I'd like to just ignore them and not have to use their services but.................
Thanks for all your time and effort for trying to sort this, it is very kind and thoughtful of you to be so concerned. Will attempt the suggestion given...
n00dles xxx