Anyone remember the absurd system which was trialled at North Luffenham? Some electronic card inserted into a reader which would allow access to the OM and its car park. It wasn't long before the fence next to the reader had been pushed in, so that people could at least walk to the OM...
Visitors (e.g. aircrew doing AMTC courses) weren't allowed to park their cars in the OM car park, but had to leave them in an insecure area, with the reassurance that it was routinely checked during Plod patrols. As for parking at the AMTC site - forget it. You had to park on some bit of disused runway miles away, so it was simpler to walk from the OM to AMTC, assuming you remembered to leave yourself enough time.
A unit so far up itself I have rarely encountered.