You want me to read 22 pages (I read 10years ago) ?
Can you do specific quotes with context.
ETA You’ll be looking for 3.7 which states that a certified competent person has to certify the works if theyre carried out by someone not registered.
3.8 on describes how you can request your local building control body to certify the works (the LA really don’t like that)
You have remarkable recall if you read that 10 years ago

however I think 3.7 is referring to work that is non notifiable:
“Non-notifiable work 2.7 Regulation 12(6A) sets out electrical installation work that is notifiable. All other electrical installation work is not notifiable – namely additions and alterations to existing installations outside special locations, and replacements, repairs and maintenance anywhere. 2.8 Installing fixed electrical equipment is within the scope of Part P, even if the final connection is by a standard 13A plug and socket, but is notifiable only if it involves work set out in regulation 12(6A). For example: a. installing a built-in cooker is not notifiable work unless a new cooker circuit is needed b. connecting an electric gate or garage door to an existing isolator switch is not notifiable work, but installing a new circuit from the consumer unit to the isolator is notifiable.
2.9 Installing prefabricated, modular wiring (for example for kitchen lighting systems) linked by plug and socket connectors is also within the scope of Part P, but again is notifiable only if it involves work set out in regulation 12(6A).
Regulation 12(6A) states:
12.-(6A) A person intending to carry out building work in relation to which Part P of Schedule 1 imposes a requirement, is required to give a building notice or deposit full plans
(except if (a) is applied or the work is under (b) as per Notification of work above). Notification is required where work consists of –
a. The installation of a new circuit.
b. The replacement of a consumer unit
(fuse board).
c. Any addition or alteration to existing circuits in a special location.
In this regulation “special location” means –
a. Within a room containing a bath or shower, the space surrounding a bath tap or shower head, where the space extends –
1. Vertically from the finished floor level to –
i. a height of 2.25 metres; or
ii. the position of the shower head where it is attached to a wall or ceiling at a point higher than 2.25 metres from that level; and
2. Horizontally –
i. where there is a bath tub or shower tray, from the edge of the bath tub or shower tray to a distance of 0.6 metres; or
ii. where there is no bath tub or shower tray, from the centre point of the shower head
Sorry I didn’t quote before but the copying text from the online pdf was flaky. I’ve had to save it onto my iPad to copy satisfactorily
