Actually..if push came to shove and someone wanted to be arsey with you..
There IS official guidance in Approved Document P page 11 section b notifying work when installer is competent but not registered to self cert their work...
HOWEVER....
It is my understanding (Here-say) that most assessments are assessing your knowledge and application of BS7671 regs & rules..
NOT the notification process of Part P...
My own first assessment was carried out at the start of Part P after I had been trading for several years already,...
where electricians had been trading and working on all sorts of jobs from rewire to move a light!
so jobs, (that did not need to be notified), completed within the past few months prior to assessment were in abundance..
BUT..
I haven't heard of anyone failing an assessment because a job was not notified?
:C