LONDON—The British Olympic team’s former doctor Richard Budgett — now chief medical officer for the 2012 Games — explained to an expert panel discussion on Mass Gatherings Medicine, held at the London School of Hygiene and Tropical Medicine, how every medical need of 10 000 athletes, 10 million ticket holders and untold numbers of staff, volunteers and ordinary Londoners is being taken care of to ensure a healthy London 2012.