Another OR update on ECI transmission posted 30/8/16https://www.openreach.co.uk/orpg/home/updates/briefings/super-fastfibreaccessbriefings/super-fastfibreaccessbriefingsarticles/nga02316.do
All they needed to do was enforce their own guidelines i.e. ban incompatible devices. But they took the path of least resistance instead.