Go here, type in phonenumber / postcode on the right hand side:
https://www.bethere.co.uk/homebroadband.do
( TonyUNDERSCORE from the Internet, Tue 30 Jun 2009, 18:18, archived)

That doesn't tell you the distance to the exchange.
It just guesses some shit. They reckon I can get 11mb's but it's basically wrong.
( mike woz ere 7442200 & 7696970 getter, Tue 30 Jun 2009, 18:24, archived)

I'm about a km away

( my other username is a porsche , posting shit pictures so you don't have to, Tue 30 Jun 2009, 18:26, archived)