hi all. im in the middle of re doing all the rooms upstairs and i want to add/move some radiators. at the moment ive got 2 15mm pipes coming upstairs and 8mm microbore pipes run from them to the radiators. ive tryed to find some more 8mm fittings and pipes to carry on the same as whats there but its difficult to find them. someone suggested i just change it to plastic. so is there a manifold that i connect to the 2 15mm pipes so i can run 4 radiators from them? or would i be better off trying to find some 8mm pipe and fittings? the pipes for 2 of the radiators only need to be extended about 500-1000mm and the other 2 ill have to run completely new pipes( approx 30meters) thanx