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I don't know specifically about Telewest, but if it's anything like ntl it will be something that is not supported (in other words the ISP will not help you to solve problems), but that doesn't mean it can't be done. ntl retain a right to ask you to stop if it is affecting their network. It will depend on how intensively you use it.
Remember that Telewest have a blanket clause that the connection it to be used for residential not business purposes (assuming you are a residential user).
I have successfully set up a VPN into my office from my ntl account, using the standard M$ Windows XP VPN connection wizards. Again I don't know about the specifics of your setup, sorry.
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This thread would imply VPN can work over Telewest :
http://www.cableforum.co.uk/board/sh...ad.php?t=30820