This is not a BT or Openreach problem, it's an industry problem.

The existing network is available for use by any service provider if they are willing to make the investment, and hand on heart would you for such little return ???

I come from a background of hands on network knowledge of the Openreach network and then dealing with the highest level of service interruption problems. There is no way anyone should be running anything business critical over FTTC as the SLA just isn't there. It will go off, and you will loose service for more than a few hours during office hours. Could your business cope with that? If the answer is no then look for another solution.

My whole job was listening to people who were paying £25 a month for their office internet connection shifting 100Gb a month over it, and writing to the chairman the minute it went off. Fools, and I am talking about BT as they actually care about that customer.

Cheers

Cris