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They haven't but they all heat up fine, they get hot all over, but then the boiler clicks off - which is fine if it would come back on again but it doesn't!!!! When installed the company that did the work told my mother she would never need to bleed the rads due to the stuff they put in them....? Not sure about that, but as I say, the rads all heat up very well when the system is switched on - it's just its refusal to fire up again once it clicks off - tis a mystery I have to say! Thanks Rayman :-)