1887 Dec 15 Born London as Sidney Lionel Harvey Bathurst - his mother was a Paston-Cooper, and he appears to have later changed his surname to hers. His father is a Lt Col in the Army
1891 census at 12 Great Cumberland Pl, London
1901 census He is a pupil at a private school in East Hillingdon
1905 Oct 7. His father changed the family name to "Paston Cooper" by Royal Licence
1908 May 8. His father died.
1910 Mar 3. 4th Battalion, The Bedfordshire Regiment, S L Paston-Cooper to be Second Lieutenant (on probation)
1911 Feb 4. 4th Battalion, The Bedfordshire Regiment, Second Lieutenant (on probation)S L. Paston-Cooper resigns his commission.
1912 Jun 12 Leaves UK for Canada. He is a "clerk" and intends living in Canada. He is now "Cooper" and a "farmer"
1915 Jun 12. 4th Battalion, The Bedfordshire Regiment, Sidney Lionel Paston-Cooper, late Second Lieutenant of the Battalion, to be Lieutenant. Dated 12th June, 1915.
1917 Jan 1. Bedf, R.—The undermentioned Lts. to be Capts., but not to carry pay or allowances of .that rank prior to 1st July 1917, unless holding temp, or actg. higher rank with pay and allowances: S. L. Paston-Cooper, and to remain . seed. .
1917 Mar 6. Bedford . R.—Lt. S. L. Paston-Cooper is seed, for duty with a Garr. Bn.
1917 Jul 1917 Bedf R.—The undermentioned Lts. to be Capts., but not to carry pay or allowances of .that rank prior to 1st July 1917, unless holding temp, or actg'. higher rank with pay and allowances: — S. L. Paston-Cooper, and to remain . seed.
1920 Mar 9. Bankruptcy receiving order - Sidney Lionel Paston-Cooper, The Bear Hotel, Maidenhead, in the county of Berks.
1921 Jan 26 Joined ADRIC with service no 1602. Posted to O Coy
1921 Feb 4. Posted L Coy
1921 Mar 7 Posted to J Coy
1921 Mar 21. Discharged on medical grounds, not due to service in RIC
1927 Apr/Jun Married in London to Ermyntrude M Caley
1934 Sep 27. Died Portsmouth aged 46.