"If it works it'll go nationwide, says telco's top dog"
Yeah, right. Just like Infinity that I still can't get in my area.
BT, or rather the part of BT that customers deal with, is staffed with sadists, dreamers and idiots. Their call centres are laughably and staggeringly inept, their marketing department is er... somewhat divorced (for want of a better word) from reality, and the remaining good engineers are smothered by so many layers of idiocy it's a miracle they get anything done at all.
This will not work and it will not happen.