BT & TalkTalk both use OpenReach's infrastructure for last-mile; they have separate backhaul networks but the limiting factor is always the copper from the cabinet or exchange.
I would say, the UK has 2 major infrastructure networks (OpenReach, split off from BT, formed from the GPO; Telewest:NTL, now absorbed into Virgin Media) + some minor, growing networks (CityFibre).
I would say, the UK has 2 major infrastructure networks (OpenReach, split off from BT, formed from the GPO; Telewest:NTL, now absorbed into Virgin Media) + some minor, growing networks (CityFibre).