As said before, the CAA don't check FEs before every PPL test - we are however checked after each test, since part of the post-test paperwork is sending a copy of the test form to the CFE (or SFE now!) at Bournemouth, where sampling is undertaken to check that PPL tests are being conducted within the bounds of the schedule. As a new FE I would be mortified if I conducted a test I wasn't allowed to do, and would make every effort to make the situation right.
I don't suppose though this is the same FE though who recently insisted he could conduct a MEP Rating LST despite having done the training course himself? Being a FTO HoT doesn't sadly guarantee perfect knowledge, although customers have every right to expect it.