Well 1) the bathroom is not earthed but that's okay I am told as it has a doubly insulated light fitting. I understood originally from the electrician who did the test that it was okay that the lights are not earthed as they are in bedrooms and have plastic pendant fittings. At the 2014 EICR it passed. So I am confused.No lights need an Earth if double insulated.....right up until the 18th When all circuits need rcd protection in a domestic setting...which can’t happen with no cpc, I would say that if the others have cpcs you may have them there and they’ve just been cut out (no uncommon) which is why they’ll want to access the loft to rectify.....in fairness to the sparks if they can find it that’s a cheap fix for you