 With the boom in travel in the Edwardian era, John Mason Cook's sons, Frank Henry, Thomas Albert and Ernest Edward, were even more successful than their father and grandfather had been at running the business.Frank and Ernest opened a new headquarters in Berkeley Street, London in 1926, but unexpectedly sold the business two years later to the Compagnie Internationale des Wagons-Lits et des Grandes Express Européens, operator of the Orient Express.After the Fall of France, the Paris headquarters of the Wagons-Lits company was seized by the Germans, and the British assets taken over by the Custodian of Enemy Property.