I don't know exactly which units constituted 5 AGRA but on 30 November 1943 while serving in Italy the units allotted to 5, 6 and 10 AGRA all had serial numbers in the 300 bracket.
When 5 AGRA went to Europe and became Army Troops (2 Army), it was allotted the serials 1191-1199 according to Hodges and Taylor, British Military Markings. The formation sign was that of the Army under which they came for command.
Also the AGRAs belonged to 15 Army Group in Italy and may have used a formation sign appropriate to that formation rather than an individual one. More importantly is that AGRA had white horizontal or diagonal lines on the plate in conjunction with the number, denoting their senior formation, i.e., army group, army, or corps.
Three figure numbers starting around 100 without any formation distinguishing bars were a distinction of a Corps Troops unit of the late 1950s in UK forces.
Keith
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