The installation of any new circuits in your home must be completed by a Part P qualified electrician. Failure to follow these provisions may result in difficulty selling your home at a later date, or in your house insurance being invalidated.
When completing any electrical work in your home, you should ensure that your work is checked by a qualified electrician prior to connecting your work to the power supply. It is also a good idea to receive a certificate stating that your work has been checked.
Before touching any wires or cabling, it is important to ensure the power supply is switched off at the mains and disconnected by removing the fuse from your double-pole switch.
Decide where you want the additional light positioned. Mark out the space, ensuring that you are not trying to go through a wall or ceiling stud. Make sure there is a power supply to your location that is able to run the light. Both radial and ring main circuits have restrictions on the number of outlets and the length of each circuit.
If that is all okay, then you may proceed with fitting the light into the wall by cutting your marking, ensuring that you do not cut the cable or wire behind the wall. Depending on its location, you may need to add a wall stud to secure the cable and switch box. Slide your light box into the wall cavity and thread the cables into it. Strip the cable and, making sure you pay attention to the colours and functions of the wires, connect to your light fitting. You can then place plasterboard over the light box, ensuring that you allow a hole for the cable to extend from for the light fitting. Attach the light fitting to the wall.