Great War related records listed here are discussed under ‘Great War Medal Rolls and Other Records held by the Army Medal Office in 1961 (there is a link here, the relevant entries for these records are included both here and on the page discussed)’.
Great War (and after) period General Service Medals are also listed here. A link (Ancestry Pay Site) to an Army Form B 95 (for a General Service Medal issued for service in Iraq, completed by the Hounslow Infantry Record Office in 1926) can be found below. The form has a print date of 2/23 and was part of a print run of 100,000 copies:
Copies of Army Form B 95 can alternatively be found by looking online at the The National Archives (TNA) WO 100 series Campaign Medal and Award Rolls, where selected medal rolls have been made available digitally (for free). The following is a link to a National Archives catalogue search for WO 100 Rolls relevant to the General Service Medal and Iraq in the Interwar period.
From The National Archives (TNA) PRO 58/218 Army Medal Office, Droitwich: attached to letter from Mr Sydney, War Office to R.D. Farmer P.R.O. (4 July 1961)