If you do decide to go with BT sign up for the 150 service and then upgrade it to 900. Mine was installed earlier this week on the basic service, I checked the upgrade options via MyBT the next day and got the 900 service for £54.99.
Worth knowing thanks, looks like a £5/month saving. Contractors are currently putting fibre to the poles on our estate, seem to have just put extra poles in and connecting those, not see anything going into the ground yet.