In early 1957, at my secondary school in Middlesex, I was 15 years of age and in the metal work class when I heard someone shout: “Stop, stop.” I immediately pressed the red ‘stop’ button on the wall by the machine I was working on and the room went quickly silent. The teacher came out of his office and asked who stopped the machines. I said that I had heard someone say stop twice, so I pressed the red button. The teacher assumed I was playing games so he told me to come to the front of the room and