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Thanks. However I want to exhaust all possible other options because doing an expensive pipe re-fit. I tried individually cleaning some of the rads today. Closing them off and draining and flushing each rad. Loads of black gunk came out. One of them had good flow coming through the hot feed...

Please help! I Recently moved into an old Victorian house. New boiler was fitted just before we moved in, but the central heating radiators and pipes were installed about 25 years ago. There are about 16 radiators spread across 3 floors The radiators all have 10mm grey plastic microbore...