I have good news and bad news.
The good news is, I have just finished rummaging around the clever worldwide interweb for phone numbers I can put through BT's broadband checker to try to get a better idea what might be available at my new pad. In the course of this, I discovered that my local 'phone exchange is a lot closer than I thought - less than 5km, in fact, which puts me in range of 1 or 2mb ADSL now BT has extended its reach. Yay!
The bad news, however, is that this exchange is one of the few they have no intention of upgrading without some form of corporate sponsorship, under their so-called 'Exchange Activate' programme, being as it is very remote and serves only a few people. As if BT isn't coining it in already. Tight gits.
Back to the dial-up drawing board, then.