This from p. 179 of Badges & Insignia of the British Armed Services by May, Carman & Tanner:
ROYAL ARMS IN WREATH: The new badge of the Royal Arms within a laurel wreath was introduced by Army Order 309 in 1918 for the grade of warrant officer class I which at that time covered conductor, staff-sergeant-major Ist class, schoolmaster Ist class and master-gunner Ist class (with gun). The same appointments continue today except that the schoolmaster has disappeared.
Regarding Marc's post about the gun below, Brian L. Davis p. 20-21 states that the gun was worn above c. 1936 and below c. 1941 and 1944.
Rgds, Thomas
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