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Could you not just, after closing the rad valves each end, unscrew the blanking plug? A little water will flow out but can be easily caught with a container under the rad. Has advantages that dont have to disturb the valve joint. Or is there a clear advantage of cracking open the valve joint?

I have Danfoss TRVs and they recommend installing them on return side of radiator - horizontally. That way they are less likely to be influenced by heat from a hot pipe immediatly below the sensor head. I would advise not removing the TRV from hall rad if you are thinking of a wireless...

Thanks everyone for your suggestions. I have now come to the conclusion the problem is probably not an air lock (cos when the circulation starts it would just move the air to a radiator which it doesnt) but the opposite - a blockage at the bottom of the boiler caused by sludge. So I intend to...

But surely I could not have sufficient hydrogen build up to 'air lock' the boiler every 24 hours??? And once the circulation starts where is the gas going? - it must get trapped in a radiator but I dont have gas in the radiators.

I have 7 year-old Potterton Kingfisher CFL 100 boiler operating a sealed room heating and hot water system. For years, air in the system used to accumulate in the upstairs radiator nearest to the boiler. Simple to vent. About 6 months ago, air stopped accumulating in any radiator and the pump...