You are thinking of ADSL, which is limited to 24mpbs. BT does sell VDSL as fibre, but usually the distance of copper connection is only out to the street.
From the plusnet page: > Speeds are available as follows:
> Average download speeds of 36Mb† or 66Mb† for Fibre (FTTC) enabled areas depending on the package you choose > Average download speeds of 10MbΦ for ADSL2+ enabled areas