Earlier quoted context omitted.
The UK is pretty much there on IPV6 - BT (and by extension anyone who uses BT's network, so, everyone except Virgin Cable and Kingston Communications in Hull) now offers native IPV6 - you get delegated a /56 (albeit a dynamic /56 allocation for most). The tricky part is router support - BT's own equipment supports it for the most part (Only the Smart Hub and Home Hub 5), but third party routers can be difficult - TPL…
Don't most areas have local loop unbundling, so you're on your ISP's network rather than BT's?
Sorry, just seen this.
Partly - FTTC is run over BT's network all the way through to 27 regional POPs where it is passed over to the providers network, or they can opt to use the BT network instead.