I have been in the situation where failing to follow my gut instinct has turned out to be a disaster. Last night, I sent him details of all the materials I will need for the job (including pipe clips). He replied querying my need for a length of 15 & 22 mm copper pipes? Said all I need to do is take out old glow-worm boiler and fit the one he provides. As if it's as easy as that, ffftttttt. When I rang to tell him there is more to replacing a boiler than just taking old one out and replacing with new, he said I must email him details of the exact work replacement procedure. I am happy to do that, but if this is how every other job is going to be, then I think this relationship will end before it even begins. I am more than happy to leave behind any off-cuts and left over copper pipes etc for him to retrieve at his convenience. Apparently, BG (with whom he says he has a Service Contract) have asked him to replace four boilers in the last two months all of them fitted 4-5 yrs ago. I wonder why??? If you are paying £120/day to an RGI, chances are there will be no incentive to properly flush the system