Before you start, plug in a light & switch on. Turn off the power supply at the consumer unit - the light should go off
IMPORTANT: double check the power is off by turning the switch on & off and checking the light doesn’t come on.
Unscrew the screws holding the socket in place.
If the socket has been painted & won’t move, score the edge with a sharp knife then prise with a screwdriver.
Carefully pull out the socket.
Unscrew the terminals & remove the wires to release the old socket.
The terminals are labelled green/yellow for earth, brown for live & blue for neutral. Match up the colours of the wires
On older sockets, you may find green for earth, red for live & black for neutral.
Place the wires in the correct terminals (green/yellow: earth, brown/red: live, blue/black: neutral)
Check the wires are secure.
Carefully push the wires back behind the socket.
Re-attach the socket with screws, ensuring you tighten each side evenly.
Restore the power at the consumer unit & check the new switch works.