Hi, I'm just filling in the Medical Standards Leaflet for my AST and it asks for my URN and reference number. I'm guessing URN stands for Unique Reference Number or something similar but as there is nothing anywhere on the website or in any of the forms I cant be sure. Also, I don't actually have anything labelled as an URN. There is a 13 digit number simply labelled 'Reference' at the top of one of my emails from the AFCO so I'm guessing that is it as there is no other reference to a reference number anywhere! Could anyone confirm if that is what I'm looking for if I'm missing something somewhere? Apologies if I've been a bit thick and missed something obvious but I've looked everywhere for an explanation of this and found nothing.