My ISP is PlusNet ( a BT subsidiary Company ) This is their reply to my query regarding the availability of Fibre.
Determining who can and can't get FTTC at the moment is a bit of a complicated task as the only easy way to do is to check each phone number 1 by 1. Which is rather impractical when we have several thousand customers on the enabled exchanges. It's was pretty hard to manage when there were just 2 exchanges. So at the moment the trial is pretty low key, if people are interested in it and they can get it, and the accept the trial Ts & Cs etc. then we'll happily add people to the trial but we're letting them come to us at the moment rather than us going to them.
The best thing to do is keep an eye on the BT availability checker here:
http://www.dslchecker.bt..../adsl/adslchecker.welcome
Once your exchange and cabinets have ready dates this will show up, some of the dates do move around, there's a couple of threads on the forum now from people in Luton and Basingstoke where the dates keep changing.
Once it's enabled just drop me another PM and I'll let you know how to take part.