I bet the neutral from the rcbo is in the neutral bar along with the neutral in the circuit so as soon as a load is plugged in there is no return path through the rcbo
Neutral from ccu to n on ceiling rose
Line conductor from ccu to com on first switch
2 strappers from l1 and l2 of first switch to second switch
Com on second switch to s/l on ceiling rose
Also cpc every where
Your college can write you a letter that you can give to jib they will accept it as I am on the level 2 course aswell and a few of the other students have done it like that
I'm currently doing level 2 on weekends doing it in 9 months I feel that is a nice steady pace and plenty of room to learn level 3 is also over the same period
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