Hi all, Looking for some advice and to see if anyone has experienced the issue I'm having with Central Heating. Two up Two down house, around a year ago I noticed the downstairs radiators were not working. As winter is approaching, I called a Plumber to come take a look, he advised a new boiler as the one I had was very old. New boiler fitted, same issue with the radiators downstairs, freezing cold. He's since tried using Sludge cleaner on the system and it hasn't really worked. Only two of 3 radiators upstairs work, and down stairs are all freezing. I have to close all radiators off bar 1 (that I want to heat) for it to work. When all Valves are open only two radiators work and the rest don't. Tried balancing, tried bleeding. Plumber is now talking about repiping, but I'm worried I could pay for that and it still not be the issue. Any advice or experience with similar? Thanks.