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I just posted another part to this question and it's dissappeared! flaming technology!!!!
When I spoke to the lady at BT, she told me that there had been a line in there at some point already, so it would just need to be re-connected, as long as Telewest have left it in a decent enough state.
How would I go about getting the internet for 3 months if I have to wait before I can change to a different company? my Fiancee uses it for work, so we will need to have it, however, if we were to use BT, it would mean me signing up for another 12 month contract, surley?