@ Jared Hunt
You're wrong. The line rental is a standing charge for the voice service.
In France, you can have ADSL via the copper pair but choose to have no voice service active - i.e. no dial tone, no phone service. You just pay for the ADSL. It's cheaper than having ADSL plus voice service.
In the UK, you can't have ADSL without also renting the phone service. Whether you make calls or not, you still have to pay £11 or so per month for voice service rental. There's no choice.
So yes, it is technically possible to have ADSL without a phone line.
Incidentally, when I moved house my BT voice line in my old place was cut off, but the O2 broadband connection was still active a week later. So it is possible!