The Army number, 14,267,445, is for the General Service Corps. It looks like from 1942 recruits began their initial training with the General Service Corps, 14,649,782 joined on 15 July 1943, so the Army number could fit for anybody who had joined any formation in 1942 or early 1943. Not much of an help, I am afraid. Source:
http://www.researchingww2.co.uk/army...tish-army-ww2/