Just to toss my experience into the pot .. rang CS today and a very helpful Scottish lady worked some magic and told me all I needed to do was reboot my PC to get my 3Mb service.
I did so .. no broadband whatsover.
The router wasn't getting an IP address from the DHCP server. Call CS back. First guy's PC was unable to get to my account so he transferred, more waiting on hold. Next person can't see any problem, she wonders if the first hit was sent to my old Pace box, so she re-tries hitting my Sammy.
Nothing.
She tried again, still no joy, apparently the STB should have rebooted, it didn't. She then transferred me to 'faults' in the same building (whatever that means) who proceeded to tell me they couldn't help and I had to call 'BB faults' at my expense. I complained since it was NTL's system that had broken by connection, "they'll ring you back" I was told.
Called BB support, "no we don't call back" .. there's a surprise.
After 10 mins or so he told me that CS had screwed up and done two hits, one to upgrade me and another which had removed me.
Bottom line: I had to reprovision and hope that the billing system didn't get triggered by all their screwing about.