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Sorry to report to all that, having tried all the options, nothing has made any difference to the deafening sporadic noises, so nothing for it but to call in the experts and let them have a look. Thanks anyway to you all.

Thanks ... I'll get the boyfriend onto this one and let you know if it works. x

Hi, thanks for the prompt reply. I keep the boiler at half to one all the time, so don't think this is the problem. No idea how to change the pump setting?? MimiJane

I've just moved into a property which is about 15 years old and is fitted with a Concord WRS boiler and radiators with values in every room (supplied by a local retailer when it was built). About 30 minutes after the heating has been switched on, one or two radiators start to rattle, hum or...