OpenReach look to be cut out the picture on this one unless GTC are using them in the background. The market will be getting ultra competitive if OpenReach doesn't push FTTH properly. Doesn't look like the other large ISP's are going to sit idle. Virgin will have competitive options with the DOCSIS hybrid fibre network as well.
Would be surprised if TalkTalk started signing whole sale deals with developers putting in fibre deployments as well.
I'm sure Hyperoptic wouldn't mind teaming up with someone.