Back in the 1970s, I once made an impromptu appearance on a live edition of Gardening Today. I was cheating my way around the school cross country course along with a couple of my mates, and crawling under a hedge to avoid having to do a second lap of Kings Heath Park. One by one, we all looked up with an expression of horror to find that we had emerged immediately behind Cyril Fletcher and right in front of a rolling TV camera in the BBC TV Garden. It was a bit reminiscent of that scene in The Great Escape, where everyone in turn realised that the tunnel had come up 40 feet short. We all scuttled off one by one, bent over double trying not to be seen. Exit stage left, never to be seen on TV again.