Back in 1994, a large number of Americans came through Heathrow Terminal 4 where I was an Immigration Officer, it being the 50th anniversary of the Invasion. One came to my desk, with his much younger wife.... I asked him how long he intended to stay and what they were going to do....He told me there were in Europe for the commemoration of the Invasion...but his wife didn't like him talking about it (!) So I asked him what it was he had done....and he told me he had been a Hamilcar glider pilot. "Those were the ones with tanks in the back, weren't they?" I asked him....he nodded....so I said "I'm terribly sorry, I won't be able to admit you to the UK." "Why not?" he asked....so I told him we were expressly forbidden to admit lunatics (!) ... he started to laugh and said they were all young and crazy.....