iainmet: We are stuck with Sky. No VM at all and Infinity was supposed to launch 31st March here, checking it though the date has moved to 30th June unfortunately. Thankfully Sky has launched their fibre on the BT network start of April so we should be able to get Fibre once it is up and running immediately.
That's strang Sky use exactly the same fibre network as BT so if it's available on Sky it'll be available on BT. The dates you are getting from BT are estimates that always fall at the end of a quarter. Mine changed at the end of each quarter for a year and a half before I finally got it.
I'm chuffed though as BT have just rolled out an upgrade I've gone from 40/10 to 80/20!