Reynolds organised a gang of 15 men to undertake the 1963 Great Train Robbery (which he later referred to as his "Sistine Chapel ceiling"). After the theft, Reynolds spent six months in a mews house in South Kensington waiting for a false passport. He then travelled via Elstree Airfield to Ostend, was then driven to Brussels Airport, before flying with Sabena airlines to Mexico City via Toronto. Assuming the name "Keith Clement Miller", he was joined by his wife Frances, who changed her name to Angela, and son Nick.