It is astonishing. The evidence suggests that there is very little validation. The CAA stopped accepting feedback and discussions from FTOs about possibly defective questions some years ago, saying that they didn't have the staff available to deal with queries, and now only accept appeals from candidates, not those routed through FTOs.
Under EASA the national Authority, the CAA, will still be responsible for producing exams and issuing licences. We had assumed that the exams would be generated from a properly maintained Central Question Bank, generated and owned by EASA. This may no longer be the case.