[Paul]

You can do the faceplates yourself but if it goes wrong then you will be subject to an engineer call out charge if BT have to put it right again. As Matt says it's on the Customer Side of the line so it's yours to do with as you please. DO NOT if possible tamper with the main socket/ test socket, this should be the first socket on the line as it enters the house, this socket is extremely important for diagnosing faults and if you tamper with it you will most likely face a call out fee from BT.