BT has not yet started marketing FTTC broadband to consumers in the Cornwall area, though that doesn’t mean that “mere” consumers can’t have the service.
BT has advised me that the first FTTC broadband cabinets in Cornwall went live on Monday 17th January. From that date, BT Wholesale are accepting orders for provision of lines on those cabinets in the Threewaters exchange area.
BT has also started marketing to businesses in the area, but not yet to consumers (though that doesn’t mean that if you are a “mere” consumer you can’t have the service).
I would expect it to be a straightforward sale to a business. If one day you can’t have broadband and the next you are offered 40Megs, you would have to be daft to say no (this might be a slight dramatisation of the situation on the ground).
Cornwall is an interesting situation, having been the subject of large grants to “broadband enable” the county, and is regarded by some (not everyone) as a prototype for other areas with broadly rural populations.
I have some specific FTTC broadband cabinet/postcode details if you want to drop me a line.