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Thank for replying. I don't think it's trapped air as I went round all the rads twice bleeding them when I refilled the system. It just takes an awful long time for the 2 rads to warm, say an hour, and even then they are 'slightly' warm (all over) and not hot. I fear there may be a blockage in...

Hi, this has been a long standing problem at my property, but determined to fix it since recent activity. I recently had to replace the ball valve in the header tank. In doing so I drained the system fully to clean half an inch of sludge out the bottom. I should say that the system is old -...