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Thanks for the advice, much appreciated. Another stupid question...where would the drain point be? What does it look like?...ok two stupid questions!

My fault, I did not explain it too well. They actually fitted a new timer control, so that I could set the heating to come on at different times during the day. At first there was not any problem but now two radiators downstairs do not come on unless I bleed them and they get hot once I do this.

Thx for reply, I think it started happening when the heating guys put a new heating control switch on my boiler.

Desperate for help! Two of my downstairs radiators are staying cold. If I bleed them the hot water comes through after 5mins but once I stop they go cold again. All my other radiators are working fine but I do have to constantly bleed 3 of them upstairs because they always seem to get trapped...