Been ages since this was posted so thought worth reposting as such a great deal.
It is localised - York and surrounding area only - though there is a postcode checker as rolling out quickly elsewhere so register your interest if you can't already get!
If you can get it then it's a no brainer. I would kill for this.
£21.70 per month ALL IN!!
ASWELL AS FREE ACTIVATION which is normally £50.
To register for updates on when it'll be available in your area sign up here - https://ultrafibreoptic.talktalk.co.uk/