Ian,
You are correct when you say that the green 84 was in use early in the War. It changed in mid 1944, to a red background with white 2-28 over 56. Apparently, under the old system, which was linked to divisions, any changes in the orbat meant a total change of vehicle signage.
This latter signage incorporated a very low grade "code" where 56 indicated infantry.
I think Tony may have provided the basics of the 2/28th (captured at Ruin Ridge in North Africa after being isolated and nearly surrounded by German armour - some reports saying the armour in use by the Germans were captured Valentines !)
Jack
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