I wonder if CMP trucks were given WD numbers in Canada , ( the number minus the letter prefix would be assigned to vehicle for its lifespan ) so they would have Canadian lettering when shipped overseas . You would assume the end user UK units would change the Letters when received , but maybe they better things to do , like fight a war ? I 've seen pictures of some Canadian units with tanks that had just a T number , not CT , maybe replacements rushed into combat , we'll paint them later sort of thing ? It will easy to cut off the C to make them Brit trucks