But having a BT landline would mean that yes, I'd be able to have ADSL. But I'd then be paying for a BT landline and ALSO the current NTL landline that I hardly ever use, only for 0800/0845/0870 etc. calls.
Getting rid of the NTL line is pointless as it's included as part of the price of the digital tv package. In which case it would mean going to Sky.
Which in overall would be a massive hassle for a tiny little saving on a service that is currently fine