There is a catch
At the moment if you are on a slower speed then you have a 1GB a day limit (aka a Cap). That means after you have downloaded that amount of data then NTL reserve the right to charge extra or slow down your connection.
Every email, webpace picture file and folder that comes onto your PC via your connection counts towards you limit.
If you upgrade the Cap changes to 3GB per calendar month. That is why I have not and will not upgrade from my 300k connection.