Replace faulty BT master socket & move it 8 metres into another room

I have a faulty BT master socket. Currently I have the router wired in to the test socket. The socket is in the corner of the bedroom in the apartment. I would like the socket replaced and also move internally to the main room so the TV, playstation etc and be wired directly, not use wifi. I'm fine for during the move of the socket the cable internally is fixed to the top of skirting boards/round door frames. I only want this done by a certified BT electrician that will give a guarantee on the work.