At Eton College, John developed a taste for gambling. He supplemented his pocket money with income from bookmaking, placing his earnings into a "secret" bank account, and regularly left the school's grounds to attend horse races. According to his mother John's academic record was "far from creditable", but he became Captain of Roe's House, before leaving in 1953 to undertake his National Service. He became a second lieutenant in his father's regiment, the Coldstream Guards, and was stationed mainly in Krefeld, West Germany. While there, he also became a keen poker player.