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Thanks for that sensible reply, might be worth a go first. fingers crossed :D

It is a Honeywell, and quite old, around 15 years, but it worked so I didn't see the point in replacing it. All the other valves are on the 'in' end of the radiators, and no noise. I take it I have to drain the whole system to change the TRV over then?

Hi, newbie here so please excuse my silly questions :oops: I have one radiator, repositioned last year, which has been making a rat-a-tat noise ever since, just like someone drumming fingers on a table. It appears to be linked to the thermostatic radiator valve, as I can temporarily stop...