NTL will probably never upgrade Milton Keynes, due to restrictions from MK council and the horrendous costs in the re-cabling. However, it may get wireless broadband, but thats a very big MAY.
Alas there are a quite a few CATV only areas such as milton keynes, ie Martlesham Heath, Barbican etc.
If you want digi TV/tel, I think you will be resigned to BT/Sky
HTH
legend