The 1977 Three Swans started on Full Sutton Airfield. Many years before the prison, it was a desolate place. That night was a full on Hoar Frost. Spikes of frost over two inches high all over the acres of concrete. We left the results "caravan" during the event and when we returned it was so cold, the gas heater squirted liquid propane from the jets. I can still remember Colin Barnes biting into the cheese and tomato sandwiches he left for his breakfast and finding them frozen solid.