The only way is to ensure sufficient peole register to exceed the threshold set by BT. I wrote to the local parish council and got them to put an explanatory note in the parish magazine. We reached the threshold a couple of months later.
Around 70-80 exchanges nationally are reaching trigger levels each week at the moment. Two more near where I live (Swainsthorpe exchange) triggered last week (Mulbarton and Fundenhall) and Long Stratton which triggered a few weeks ago will be enabled in July. It's happening!
BT is also trying to ramp-up the rate at which exchanges are actually enabled - this has averaged around 25 per week so a large backlog is developing.
Best resource for info on BB deployment is Sam Knows:
http://www.samknows.com/broadband
It has many useful features.
For example: click on 'exchange search' on the left and use the search field to find an exchange (accepts part names). Get full details of registrations etc including a graph. Click on a link to get a map which shows neighbouring exchanges, colour coded according to registration status, each of which is a clickable link to the associated info for that exchange including a link to the map. Very easy to use and very informative.
Here is the map for the Lowestoft exchange area, for example (which is enabled):
http://www.samknows.com/broadband/viewmap.php?ecode=EALOW
There are also links to exchanges sorted by many different criteria including by county.
Of course, ADSL has many limitations and problems, such as distance from the exchange, but that is another issue :-)
Syd