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William Ernest Du Cros
Founder of W. and G. Du Cros with his brother.
c.1874 Born son of William Harvey Du Cros
1904 DU CROS, William, 14, Regent Street, London, S.W. Cars: 12-h.p. and 24-h.p. Panhard. Is joint managing director with his brother, Mr. George du Cros, of the Panhard-Levassor agency. Is a Lieut. in the 2nd V.B Warwickshire Regt. Intends to enter motor racing circles. .
1907 "Messrs. George Du Cros, Warwick Wright, William Du Cros, D'Arcy Baker, and Macaulay Mort have followed the example of Sir A. J. Macdonald and Mr. Walter Gibbons and resigned from the Royal Automobile Club, in order to entirely sever their connection with the Motor Union, of whose imitation of the Automobile Association's road work they disapprove." 
1937 Obituary. Died aged 63 years. Fifth son of William Harvey Du Cros. 1892-95 he lived in Belgium and France as part of the setting up of the Dunlop Pneumatic Tyre Co. In 1910 with M. Clement he travelled 246 miles in six hours sealed in a dirigible, the first dirigible flight across the channel.