Stan,
as you know, I have been on NTL Broadband (initially in Sawbridgeworth, Herts, and now Redhill Surrey) for 18 months. I also have a broadband connection at home in Cardiff....and have never had a problem. I recently upgraded to the 1mb service in Redhill (improves my VPN access to my office network) and it was all done over the phone in 10 minutes.
As they roll out broadband, it is obvious that they are going to find weak links in the cable network. Hope it stays good for you from here on.
H