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I've deleted your email address. You'll only end up with a pile of spam. If anyone does want to try this, and has problems, best to post in the thread, that way everyone can benefit.
Most people will not need to change IP anyway, unless they are trying to trick some website somewhere.
This probably will only work if you have a modem. If you have a STB internet connection, then forcing an IP change may well trigger the ntl servers to think you have a new computer connecting in which case you may need to reregister with the ntl servers.