While the list might be good for getting ideas, you probably want to take the postcode & put it into a
DSL checker to see what it says.
In that case, there is no mention of FTTC, so no date for possible installation.
As for phase 5a...
My exchange was in 4b, and went live in Nov 2010. Guildford and Woking are in 5b, and their dates have gradually pushed back from Mar 2011 to Sept & Dec 2011.
And as for serviced offices...
Remeber that you usually buy your broadband service from the office, so you are dependent on them as well as BT.