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Thanks for your replies. The Builder, the rad that would be coming out of the bedroom and into the bathroom is the same size, so thought it would be just a question of taking old one out and putting the other one in, then having a bigger one put in the bedroom. So could I have one that has the same dimensions but is a double instead of a single, presume that will give out more heat?
chas2008 I was wondering if it might be better to wait until summer but then I would have to go through another winter of feeling cold in the bedroom.
I will phone up the guy who put the system in to get a quote. Just wanted a rough idea really which is what The Builder has given me.