I cannot get his birth in India, but there are several "Whitmarsh Knight" families living and working in India at that time
1890 Jun 16. Born Mysore, India. Born - Thoburn Melville Whitmarsh Knight
1911 census at 15 Oaklands Road, Bedford
1911 Apr 1. 3rd Battalion, The Leicestershire Regiment. Melville Whitmarsh Knight to be Second Lieutenant (on probation).
1911 Dec 19. 3rd Battalion, The Leicestershire Regiment, The appointment of Melville Whitmarsh Knight to a Second Lieutenancy (on probation), which appeared in the Gazette of the 4th April, 1911, is cancelled. This is later amended to "resigns his commission"
1914 Nov 13. The undermentioned to be temporary Second Lieutenants. Melville Whitmarsh Knight
1914 Nov 13. 4th Battalion, The Duke of Edinburgh's (Wiltshire Regiment); The undermentioned to be Lieutenants: Melville Whitmarsh Knight (late Lieutenant, 3rd Battalion, The Leicestershire Regiment).
1915 Sep 6. Lands Gallipoli
1916 Jun 21. He sits Bar Exams
1920 Jun 2. He passes Final Bar Exams
1920 Jul 30 Joins ADRIC with service no 26. The register just says "Resigns" without a reason nor a date.
1921 Sep 1. Service Battalions. The undermentioned relinquish their commissions on completion of service : —Warwick. R. Temp. Lt. M. W. Knight, and retains the rank of Lt.
1929 Jun 3. Died Eltham, Kent. Suicide