"2.5 kilometres from the local exchange"
means nothing.
That would be (I presume) as the crow flys.
The line could divert past Somerset and then up to Glasgow before reaching your house.
You need to know the stats on the line before you can give an estimate.
EDIT //
I would also advise reading the Be forum here too, as you will get an idea of real experiances with the ISP.
Edited by deleted (Tue 27-Feb-07 09:54:31)