when examination papers are handed out to organisations to run themselves
No they're not. Exam papers are only issued to one person (the nominated
"Custodian of Exam Papers") who must be an authorised Ground Examiner.
Blogs sits 2 exams on Friday and 2 on Saturday; does that constitute 1 day
A sitting is defined as attendance at an Exam Centre for one day. If Blogs
goes home and comes back in morning then that is two attendances, and
therefore two sittings.
Unenforceable rules are pointless rules!
They are enforceable by 1) The ATO/Examination Centre and
2) The Ground Examiner
What you are saying is that you think the CAA have to police ATOs and
Examiners activities because these organisations/people are not capable or
trustworthy.
In that case the CAA should not delegate out this function but rather run
PPL Ground Exams themselves at set Centres on set dates.