For crying out loud!
If you have a set-top-box then tough. Call Customer services.
If you have a cable modem then go here to get your increased speed for no extra charge:
https://autoreg.autoregister.net/cgi..._tiermigration
When asked for your username and password, the username is the mailbox part of your primary NtlWorld e-mail address and the password is the same password as you primary e-mail mailbox. Use that now and you'll be automatically upgraded. Don't use that and some day soon you'll automatically be upgraded.
Then again, all of that would have fallen on many blind eyes.
For the cable modem it works as on the morning of March 8th I followed my own advise and upped from 750K to 2M without any fuss or any hassle. The whole procedure took less than one minute. Cable modem reboots on its own so as to get the new service configuration file from NTL's TFTP server.