I see what you mean Thomas, a Crusaders shield like the one on the other side for 1st Army or perhaps an occupation force as there is no sword on the cross of the shield? and the white stripe under the serial also signifies "Army Troop" attachment.
So the "B" probably is just B Platoon 228 Coy RASC.
And the reason its so "colourful" is just over exuberance on the part of the artist.
Rob
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