The reason I didn't suggest pulling wires out of the IDC connectors is that it could be seen as interfering with BT property. I think Andrew is absolutely right, though. It's not rocket science removing all non-BT wiring and starting any new internal wiring from scratch. And these days, many people only use the master socket anyway because all their phones are DECT.
Edited by BrianC1 (Mon 18-Sep-17 16:23:29)