Michael, do you have a copy of Michael D. Taylor's 1994 update to "British Military markings 1939 - 1945" ?
There is a paragraph which may be of interest to you which states :
"GHQ MEF issued on 21 September 1941 a letter, reference CRME/27954/GSD.2b which cancelled all previous instructions concerning vehicle markings..."
The list shows "76" and "98" on Green / Blue, horizontal for the Senior and Junior Armd. Car Regts respectively.
Taylor goes on to state "This is the first appearance so far traced of the Green/Blue horizontal markings for recce units. Although these serials are peculiar to MEF it is likely that the grant of a corps service colour was the prerogative of the War Office, thus indicating the issue of a, so far unidentified, letter on the same subject some time prior to September 1941".
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