Just to say that an NTL engineer came today and has sorted out problem.He said the wrong connector had been used for the modem cable in box on side of house and that the connection in the cabinet in the road was incorrect.
He also said the chap who installed the modem should have known the installation was faulty because the 2 lights on the right side of modem were not on.He seemed more annoyed about it than I was! Anyway, at least the NTL engineer I spoke to on Friday understood the modem wasn't working properly and arranged a fast call-out.A big thank you to him and thanks for the advice and support.
cheers
Mike