You probably won't get it from BT... but plenty of other companies are looking to take on those gaps.... to the point where BT are chasing and looking to commandeer their customers once they're established. Sounds like healthy competition to me.
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Sorry I should have been clearer, the works gigaclear are doing now most places is in partnership with vodafone and it's considerably cheaper than BT but not near talk talks pricing..
https://www.vodafone.co.uk/broadband/deals/gigafast
https://www.talktalk.co.uk/shop/ufo/broadband
I can't see GigaClear mentioned on any of the pages you linked, or linked from those pages... Sure it's not just one of the many subcontractors, who serve GC, Voda and just about everyone else in the industry?
I'm interested because GC are doing our area, but at their prices, and none of the others offer us anything more than 35Meg.
To be fair I'm on Virgin M500 and often get 540 meg, with about 35-40 up....
But most of it is never ever used...