I am fortunate enough to be on a cabinet that offers Gfast (although I have stayed on FTTC 80/20). However it is very frustrating to not have access to FTTC when it is 'available' but all the ports are taken.
A last resort option is to contact Openreach headoffice, and politely explain the predicament and urge openreach to consider a Gfast installation for your cabinet as a viable solution. it may prod them into assessing the cabinet as a candidate for Gfast.
High Level Complaints
Amanda Newstead
DSO & HLC Front Office
Openreach
81 Newgate Street,
London EC1A 7AJ