One thing that caught me out with my recent STB change was the password. You need the original PID No: from your 'welcome to Ntl letter', but it is not always the password in that letter, nor is it the password you may have changed it to yourself for e-mail etc. It is the password you use for your account when phoning Ntl or contacting them in any way about your account.
I got locked out on the provisioning page because I tried the other alternatives first, It was a long time since I last registered a PC on the network
