A difficult man to find. There is no record of him as "Sidney M Keyes" until he joins ADRIC in 1920. then he also appears going to Australia in 1923, in marriage in 1933 and death in 1963. He is not in BMD, nor censuses. He is not in Australian nor Canadian forces. Nor is there anything in USA census data. Nor in shipping records. Scottish and Irish census show nothing, nor does the Mormon data base. The is nothing in London Gazette nor WO.338. But then I found the deed poll which explains what happened
1898 Jan 22.Born Fulham as Sidney Moses Keizer
1901 census at 156 Ladbroke Grove, Kensington
1911 census At boarding school in Broughton Lancs. Born London
1917 Jun 27. The undermentioned cadets to be temp. 2nd Lts. (attd.). Arg. & Suth'd Highrs.— Sidney Maurice Keizer.
1918 Jan 15. R. Fus. Temp. Temp. 2nd Lt. S. M. Keizer, from Arg. & Suth'd Highrs. (attd.), to be temp. 2nd Lt. 15 Jan. 1918, with seniority 19 Dec. 1916
1920 Apr 19. I SIDNEY MAURICE KEYES, formerly called, Sidney Moses Keizer, of "Dunedin," Merton road, Southsea, in the county of Hants, a natural born, British subject, do hereby give notice, that I have assumed and intend henceforth upon all occasions and at all times to sign and use and be called and known by the surname off Keyes in lieu of and substitution for my present surname of Keizer, and that, such change or assumption of name is formally declared and evidenced by a deed poll under my band said seal, dated this tewnty-third day Of March, one thousand nine hundred and twenty, duly witnessed, attested, and enrolled in the Central Office of the Supreme County, on the 19th day of April, one thousand nine hundred and twenty.
1920 Dec 15. Royal Fusiliers. The undermentioned temp. Lt, relinquish their commissions on completion of service from the dates specified, and retain the rank of Lt.: — S M Keizer.
1920 Dec 8. Joined ADRIC with service no 1195. Posted to L Coy
1921 Jun 25. Struck off ADRIC strength as a deserter
1923 Leaves UK for Australia . Blouse manufacturer. He has been living at 32 Alfred Place , Tottenham Court Rd. Intends living in Australia
1925 and 1926 he is on Australian Electoral Roll at St Kilda West, Balaclava, Victoria, Australia He is a Shop Walker (A retail store floor supervisor.)
1929 Jun 6. Arrives in UK from Australia. His UK address is Merton Rd, Southsea (this is address in naturalisation document above) . He is a sales manager
1933 Apr/Jun Married in Plymouth to Lavinia R Badcock (there is also a cert in his original name)
1939 Register. He is living at "Lavida" Crownhill Road , Plymouth C.B., Devon with wife Lavinia. He is a Rep
1967 Jul/Sep Died Plymouth aged 69