I don't think that the kind of person who wants FTTP would have virgin... because their network is poorly maintained, not fibre optic, and throttled/censored. It's consumer grade AT BEST... and very often worse than that.
If openreach would deploy FTTP via the mentioned method upthread: Overhead tubing from existing poles, they would likely find a ready market.
One plea though, should openreach see this... Don't bundle a landline with it. That would be stupid. And therefore something that would likely happen :\