25m BT Socket Extension Kit. 25m 4 Way (2 Pair) Wire Reel - Solid Core 0.2mmSquared - CW1308. One end of the BT wire should be attached to your current Master Socket (linebox) or another extension socket using the supplied IDC tool, the cable should then be clipped into place and run to the location where you would like your new BT extension socket.
This product would be ideal for those looking to extend the range of their telephone lines in rooms with restricted access, such as bathrooms or attics.