Born May 22, 1880, being by profession, like his brother Hector, an Engineer. His chief interest in life was the Scout Movement, and he was at one time Commissioner for Hertfordshire.

In the 1914-18 war he volunteered and was commissioned in 1915. After six months in the Inns of Court O.T.C., he was posted to Mechanical Transport in which he was sent to East Africa, being Workshop Officer in an M.T.Coy. Invalided home at the end of 1916, after three months sick leave, he held the same appointment, in charge of the seven sections of the Bulford M.T. Workshops, for some months. He was posted, as Second-in-Command to another Company which was training for a secret job but this was cancelled and the Company dissolved. He was in Bulford Workshops until demobilisation. He died in 1970.

Both Hector and Eustace were long remembered in Hemel Hempstead, the former as a stickler for detail and precision, as befitted an engineer, and the latter as a "character", renowned especially for the hilariously funny Boy Scout demonstrations that he staged over many years.

Reprinted from:
• Lidderdale, Robert Halliday, An Account of the Lowland Scots Family of Lidderdale, 1950.
• Lidderdale, Halliday Adair, The Descendants of John Lidderdale 1783-1845, 1988, unpublished manuscript.

Printed in the Charterhouse Register Vol. 1 1872-1910, Cricket Quarter 1894, page 536:

Lidderdale, Eustace Henry, b. 22 May 1880: 4 s. of F.F. Lidderdale; (Gownboys); Left O.Q. 1898. University College, London.-Factory Engineer.
E.H. Lidderdale, Esq., Woodland House, Boxmoor, Herts.

Eustace Henry received the British War Medal and Victory Medal for his service in East Africa as a Lieutenant in the Royal Army Service Corp