Surely I don't need to do this yet as I only did the change on Thursday
No, you won't need to have notified anything before your assessment with Elecsa.
Ok, one last time....
You are "supposed" to notify LBC in advance that you will be carrying out notifiable work (along with a large fee). Then they come and see what you are up to. Once you complete the work, LBC come back out and sign it off for you.
In reality, most LBC's are not interested, as they know that you will notify it yourself once you become part P registered. NOTE: They only allow this "bending" of the rules for assessment jobs.
I actually did things by the book and spoke to my LBC beforehand (foolishly, you might say), and they made a note that I was carrying out notifiable work for assessment purposes to cover me.
Just relax, and as long as you have done a good job, have all the relevant paperwork in place, and can find the answers in your books, then you will be fine
Remember....They WANT you to be in the club.