Extension (Slave) Socket. You are allowed to install extension wiring so long as the connection to the master socket is via a plug, or in the case of the master socket with a detachable lower half, via the connectors on that section.
50m 2 PAIR BLACK External Telephone Cable Extension Kit copper tool socket clips
20m 2 PAIR BLACK External Telephone Cable Extension Kit 100% COPPER more on ebay
10m 2 PAIR BLACK External Telephone Cable Extension Kit tool socket clips
2m GENUINE BT BLACK EXTERNAL TELEPHONE CABLE TOUGH 1 PAIR DROPWIRE 11 OR / WH
40m COIL x DROPWIRE No.10 - 2 Pair Overhead External Telephone cable BT eq SPEC
40m Coil x DROPWIRE 3 Pair Overhead External Telephone cable equiv To BT CW1378
