Not quite sure what an "access point" does (extend the local network wirelessly?), but I'm guessing it does not do as much as a broadband router.
I Think you either need to replace it with a wireless ROUTER, or add a single port (or more) router between the cable modem and the rest of your network
http://www.ebuyer.com/customer/produ...duct_uid=52897 - No idea how good this is with NTL, but it should provide the necessary routing capability, and a USB print server as a bonus.
Other than their prices, it's hard to recommend Ebuyer, great so long as you don't have a problem.
http://www.clik2complaints.co.uk/comments/ebuyerBG.htm
Their returns procedures are a frequent cause for complaint.
There was a truly great ebuyer spoof site, and I can't find it.
The pity is, that they WERE great, once upon a time, the people were interested, they knew their products... then they got too big, too fast, and that was the end of good service.