Thanks for the comments. Handyman, your info was interesting to say the least, I didn't know it was that bad for cable providers. It certainly explains why ADSL has much better upload rates though (even the initial 512k offerings has 256 up).
Ignition: yeah, people do have BT on 24/7, but that's because it takes so long to download anything with a 200k upload
So it seems that NTL will never raise their upload caps because of the limits of the system. How will they keep up, with 8Mb ADSL already available? 200k up isn't even enough to max out an 8Mb line with more than one or two connections.