The last conversation on this thread about exterior electrics concluded they are no longer notifiable. I've not taken the test for the most recent edition but it checks out.
You are obliged to do it properly and that should mean testing the RCD operation and Zs of the circuit. You can DIY it but bear in mind there are legitimate safety concerns both with installation and operation, so it's worth doing some research.
The last conversation on this thread about exterior electrics concluded they are no longer notifiable. I've not taken the test for the most recent edition but it checks out.
https://www.niceic.com/Niceic.com/media/Schemes/NICEIC-Part-P-Updated-Factsheet.pdf