I've just moved house (it's 10 years old). The main bedroom radiator is not heating up at all. - The pipe leading to the TRV is hot. - The system has plastic microbore pipes. - I've checked the TRV nipple and it moves up and down as it should - The Lockshield valve is open (no heat in the pipe from this valve) - I've bled all the radiators (no air from any) - I've balanced the system (all rads really hot except the main bedroom which is cold all over) I got a local plumber in to fix the problem. He says it's probably a kinked pipe and it would need the walls chasing out to locate where the kink was. This could be a big expensive job (plastering and decorating needed too). Before I give the go ahead for this, is there anything else I can do to make sure that it definitely is a kinked pipe? Many thanks!