As far as I'm aware the actual distance information is withheld by Openreach, however
BT's checker has a great estimation tool (the
VDSL Range A row) - if it shows fibre speeds for you. Cabinets not in any plans or on long copper lines don't show any estimated speed, I believe. The best way to estimate the copper distance would just be by road from the cabinet as theres no public information on the telephone routing.
This graph gives a reasonable estimate on what speed you could expect from a certain distance of copper with FTTC services.
Edited by thebigdolphin1 (Fri 02-Sep-16 15:54:39)