I use Plumba (never let me down) some use LSX niether are white but as my old boss used to say Belt and Braces, and i reckon he's even more experienced than Agile is, he did 60 years in the trade,
that all may be so but it is still gas advise, advise on a gas safe inspection, Duh it's in the title, if the public want it then let them buy a CP12 pad, oh no they can't, you really have some scary views on CC, why's that then ?
unlikely but not impossible, as to the question builder or plumber i guess the answer is if you can get a recommendation for either then go with that and see, If you can get a builder that can or has a plumber that's probably your best bet as most plumbers just plumb.
What heating system do you have, If it's pressurized then you'll notice a drop on the pressure gauge on the boiler, is that happening ?, if it's an open vented system then the ball cock on the F&E tank will keep the system topped up but depending on the size of the leak ( if there is one ) you...
You're quite right Tony, And i completely missed that point, however i was telling him not to do something rather than do something so i didn't break the rules.