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Netgear WPN802 is a Wireless Access Point, not a router. That means it is used to add wireless capability to an existing network. This will not allow you to share the NTL BB connection.
Your ADSL Router/Modem will also not work with NTL BB.
I'm afraid you are looking at a new (or ebayed) 'Cable Router' with or without wireless.
Sorry if thats not what you want to hear!