BTO have just tweeted the following exchanges are now enabled, Providing the exchanges have Sky's SVBN LLU they are all set for Sky fibre (subject to you being connected to a fibre enable cabinet)

Balby
Fraddon
Bromborough
Fencehouses
Helston
Histon
Landrake
Lindfield
Loo
Malvern
Mevagissey
Nanpean
Plymouth
Reigate
Skipton
Trafford
Verwood
Wallingford
Welwyn