Just to expand a bit more - NTL are doing a mass of network upgrades and re-segmentations over the next few months in preperation [part of] this speed increase. Remember that most of NTL's customers are on the 150k service which is being doubled to 300k - this cannot be achieved without this preperation work. I understand that many new ubr's are going to be installed (this figure could be 50 or more).
Other work is also proposed but I can't go into detail yet (to protect the innocent
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One thing to remember about Telewest is that they didn't upgrade everyone - as I recall, TW customers with BB via STB's missed out on the higher speed increases.