But Special Branch or customs and Immigration have to be informed of incoming flights and passenger names and date of birth and country of residence given. Allright, dodgy or stolen passports can be obtained, but I would think the authorities can catch those out. Concession airfields make sure they know who is using the concession. OK the EU and the impending enlargement bring some far flung countries into the free movement of people category, but I would assume a check ride before any hire to an Afgan would be a requirement of any insurance policy.