A member of WW1 Forum has the medals and confirms that George Baker had QSA, KSA and WW1 medals.
1881 May 121. Born Alverstoke, Portsmouth, Hants George Isaac Baker
1891 census There is more than 1 possible
1899 Jun 22. Attests for 3rd RDF Militia. He is working as a fitter in The Curragh, living at Church of England Institute, and working for a Mr Charleton.
1899 Aug 30. Joined RDF as a full time soldier
1900-1902 served in the South African War in 1900-1902, during which time he was promoted to Corporal. Certainly the man who joined ADRIC had SA medals
1911 census : George Baker, 1st Royal Dublin Fusiliers, Ahmednagar, Deccan, India. Military details: Sergeant 1st R D Fus . Married. Born Portsmouth Hants
1915 Apr 25 Lands in Gallipoli
1916 Feb 10 . Baker was promoted to Company Sergeant Major (WO2). CMS with "Y" company
1917 Jan 13 Commissioned. ‘In ranks 15 yrs. 184 days Company Serjeant-Major 337 days (Served - Gallipoli)
1917 Apr 23 Wounded at Battle of Arras
1918 Jul 13. Baker was promoted Lieutenant
1920 Sep 21. Joined ADRIC with service no. 613. Posted to Depot Coy
1920 Dec 25 Transferred to Ulster Police Force. He was promoted Platoon Commander on the same date while employed with Ulster Police..
1921 Mar 7 Posted to J Coy (I assume as T/Cadet)
1922 Oct 7. With Ulster Special Constabulary (see MIC)
1922 Dec 16. He was transferred to the regular Army Reserve of Officers
1939 Register. He is a Motor Engineer living at "dutch House" Limmer Lane , Bognor Regis
1941 Nov 5 This might be him
1953 Died Horsham Sussex