This seems simply, I think I am right but have got confused.
Am filling in an application form and it says list post secondary qualifications in
chronological order, so I start with my earliest qualifications, is my understanding right.
Ie I start on the form with Nat Cert, then Dip, then Degree?
I understand your confusion. The most usual way to present a CV is in reverse chronological order latest to earliest. I have 20 CV's on my desk and they are all like this. But if they have specifically asked for chronological. order then start with the earliest and work forward.