2x1 - Richard Hammond's Engineering Connections

Richard kicks off proceedings at Wembley Stadium, the high-tech home of English football. No one can deny the magnificence of Wembley, but how is its towering arch inspired by a medieval crossbow and how did a simple rock climbers’ knot help engineers raise it into place? Richard tracks down the answers – and finds out how experts preserved the famous ‘Wembley Roar’.