I personally don't believe that the CAA will want to audit every hour that a PPL applicant says he spent reading the books or doing an online quiz
I'm absolutely sure that they won't, they are already trying to duck their oversight responsibilities for existing FTOs and TRTOs - the question is whether they will have any choice in the matter. The bottom line is that the CAA will have to provide evidence to EASA Flight Standards that every PPL has been issued in accordance with Part-FCL and they will have to establish a procedure that produces such evidence - that may be achieved by auditing ATOs or......what?.