If it comes to the crunch, NTL still have the hand over BT, as they have much shorter copper runs into each house, (correct me if im wrong)
those green boxes in the street have duel copper / coxial going into each house that has the NTL service,
Im not sure around other NTL areas, But those green boxes are every where around my local area, and the line length will be shorter than BT's - Hence More speed, Same product.
In theroy, NTL could offer ADSL2+ over those copper runs if they felt BT and the LLU operators started taking a serious maket share,
In my opinion NTL is in a much better postition than, BT and the lucky few on LLU
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I know ADSL already have more users than NTL, but, the question should be how many BT users can get 10mb on there adsl line, compared to NTL
NTL users will be downloading at 1100kb+ while BT users will be losing sync