The key to finding him is the next of kin on his MIC, that leads back to the household in 1891 with both Jessie and Frederick G
1882 Feb 5. Born Stutterton, Lincs
1891 census at Pools Road, Sutterton
1901 census at South Street, Oakham. He is a boarder there and his profession is "bank clerk"
1911 Jan 11. Marries Lilian E Bell at St. Mary Magdalene, Knighton, Leicestershire
1911 census at Netherby Evington Leicester, He is married. His wife is Lilian Editha Kirkby
1915 Oct 27. The Sherwood Foresters (Nottinghamshire and Derbyshire Regiment). Frederick George Kirkby to be Second Lieutenant.
1918 Oct 11. 8th Bn., Notts. & Derby. Regt. — Lt. (actg. Capt.) C. H. Powell relinquishes actg. rank of Capt. on ceasing to be empld. as actg .Adjutant
1918 Dec 4. Lt. F. G. Kirkby relinquishes his commission on account of ill-health, and is granted the hon. rank of Lt.
1918 Dec 3. Wounded SWB eligible
1920 Aug 3. Joined ADRIC with service no 68. Posted B Coy
1920 Oct 16. Relinquishes CQM
1920 Dec 1 Promoted Platoon Commander This is only in Alphabetic Register, but not in Numeric. I don't think he ever made DI3
1921 Jul 1 to Jul 4. Under suspension
1921 Jul 8 Posted to Depot and suspended until 11 Jul 1921 and reinstated
1921 Aug 27. Posted to O Coy
1921 Dec 15 Reverts to T/Cadet, crossed out.
1922 Jan 17. Discharged on demobilisation of ADRIC
1925 Apr 15. Died, Doncaster, Yorkshire in a motor cycle accident. I cannot find the death of his wife, but his next of kin in 1925 was certainly given as his sister on MIC and probate. There is a marriage of a Lillian E Bell to a Harry S Moon in Doncaster in Apr/Jun 1925, which makes it look as if she was waiting for his death to remarry
WO 374/39914 Kirkby Capt F G could be our Frederick George, but is Capt