Better a slightly annoying Special Branch informal interview than the free flow of bad guys by air.
I've often bumped into SB and the police in out of the way airfields and landing zones. One was 10 mins after landing at a private site on a Scottish Island. Knock at the door. Rozzers on the doorstep. Short conversation. Everybody happy. Very impressed that they knew when I had been to that area before.
Mugs of steaming tea all round.
h-r