One thing to bear in mind, is that your ntl BB may not be as efficient in your new property (it may also be the same/better)
Also-I don't think ntl
have stopped selling analogue-ColeJ gave me a link earlier with analog sales on it-can't find it now.
Sky + certainly looks like an attractive option, & it's also something that ntl don't appear to be offering for quite some time yet.
HTH.