As far as I know most of Ntl's direct competitors (Sky, BT, Vonage, Skype, TalkTalk, 18185.com) all provide on-line billing facility's!
If you want to stick with Ntl for line rental then take a look at 18185.com and see how much you could save on calls as well as the £12 a year
Personally if I was with Ntl I'd resent paying £12 a year when you have no choice but to pay it if you want to make sure your bill is correct.
In fact you can get all the info you need for £10 a year if you so wish by asking for a subject access request under the DPA! Now there's a thought - if people stopped their itemised bills and asked for a SAR every year Ntl would soon drop it!