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There are technical and logistic difficulties.
First of all, as the channel numbers are allocated centrally, it's impossible do change them one region at a time, as would be ideal. So basically the whole network has to be taken off-line whilst the numbers are changed (otherwise there's the possibility of two channels being sent with the same number, which would confuse the STBs no end). Then there's the fact that with CR3, the favouites system could leave everything in a complete mess, depending on how the channels are added.
Those are the two main technical difficulties I can think of, although I'm sure Proppinupthebar can add something here.
Then there's the fact that, since everybody's (at least, everybody on one platform) numbers have to be changed on the same day, it's going to lead to massive numbers of calls to CS. Even if NTL did a mailshot and Channel NTL promo advising people that it was going to happen (which would of course cost money), they'd still be deluged. So they'd have to get every single CS person in the country working, costing them a bomb in overtime.
In short, it's an expensive thing to do, and so people high-up in NTL aren't keen on doing it.
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