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Geeza, firstly, system is new (less than 10 months old), and is a sealed system - Potterton system. As it was new and I was still working on renovations, I hadn't fitted the trvs (too much dust/building grime etc) - they were running with the simple cap cover only. This rad had the problem...

I forgot to mention, all rads have TRVs fitted. Could this be a factor?

Looking for some suggestions.... Have a gas fired central heating system, which is working perfectly except for one thing.. The living room rad takes forever to get to the correct temeprature, sometimes 40-45 minutes after the others. There are 10 rads in the system, and this one is the 6th...