One of that type of it doesn;t excist anymore was my first turning point on my test.
Thankfully someone before hand had given me the sheet which tells you which unused airfields on the chart have had a change of use in the vale of york. The one I had been aiming for had turned into a open prison or pig farm or some such and you couldn't see what it used to be. Knowing that it was fairly easy to give the old three identifiers and saying it used to be there.