No, adding an external light does not come under part p so long as there are no outdoor switches, junction boxes etc and the supply is not a new circuit from the consumer unit and the connection indoors for the light is not made in a special location etc.
If you need to find a tradesperson to get your job done, please try our local search below,
or if you are doing it yourself you can find suppliers local to you.
Select the supplier or trade you require, enter your location to begin your search.
Please select a service and enter a location to continue...
Are you a trade or supplier? You can create your listing free at DIYnot Local