Wiring a timed outside light using a socket
You don't need to do that because hard-wired timers exist.




The above are designed for easy fitting to an existing light switch. A five minute job at worst.

To add a new light switch you'd typically extend the circuit as shown at


This random website (uses new-colours for T&amp;E but you will likely find old colour T&amp;E in older homes and so will end up with a mix but that's OK)




Whether you can wire an outside light permanently to a plug that is plugged into a socket/outlet depends on where you live. Plugs are designed for flexible appliance leads and not for solid-core cable used for fixed wiring. In many places it is not permissible to use flexible wires for fixed wiring applications.