NTL will provide net access via the cable into your house. You can have any AV software you want, use any browser, any email prog etc.
The one advantage of cable BB is that you get the speed you pay for, except in cases of extreme network probs of course. None of this 'up to 8meg' business where you MAY get 2meg.
The 10mbps service gives you just that. It definately isn't the cheapest when compared directly to an ADSL package but the £11/month phone rental has to be added whereas with NTL you don't have to have a phoneline with it.