Thank you for your quick reply to my post. Unfortunately I can't agree with your diagnosis.
a) I have seen probably more than a hundred posts complaining of this problem, but I have not found anyone posting that the problem was resolved by installation.
b) It is not just the early emails sent out by Virgin that encourage you to register with virgin media, but the first web page you see on trying to register clearly states "You can register for My Virgin Media once you receive your welcome email, 2-3 days after placing your order. Your account number and area reference are on this welcome email or on your monthly bill."
THIS PROBLEM NEEDS SORTING - it is not acceptable to say it is RESOLVED