Thanks, i never thought about removing /disconecting the old supply. However it does have a yellow isloation valve. Am i allowed to turn this and disconect or would this need to be done by the plumber ? I can understand my not be allowed to run the flue also , but can i cut the holes ready for it?
I can't help but feel that it may be worth your while getting a couple of quotes for the hanging and reconnection of the boiler. At the same time, you will be able to get a feel of which bloke will allow you to do what work. If he knows he is going to get the job, it may happen that he will say that you are labouring under his supervision.
Nobody likes spending money, but it may be worth getting him to decommission and unhang the boiler from its current site (that way, if it get's damaged he'll be aware of the problem)