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Do not use an ADSL router!
ADSL and cable are different technologies.
You need a standard broadband router with an ethernet based WAN port that can connect to the ethernet port of your blueyonder supplied cable modem. Telewest supply and maintain that modem. You supply the kit that forms your own network.
ADSL routers combine the modem needed for broadband via the BT type phone line and the router. There is no place to connect the cable modem into an ADSL router.
You cannot get broadband via cable without a cable modem i.e. your motorola Surfboard (or in some cases via the modem built into the Cable Television Set Top Box. You have no choice but to use the motorola and a separate broadband router if you wish to have a home wired and / or wireless network.