In the early 1960s, flew back from Kenya to Heathrow, via Khartoum I seem to recall. I was with my nature-freak loving younger brother.
On the way into London, he started complaining about something he'd left on the plane. It was a small boiled-sweets tin, he said, and he'd left it in the overhead compartment. He wanted to go back to the airport and get it. Must have been something really precious, I thought.
"What was in it?" I asked.
"My live tick collection", he replied.