The British markings manual requires the "Arm of Service Marking" (the red square with the white 40) to be where possible on the
"off-side mud guards, front and rear".
The Formation sign ( the red jerboa) must be
"on the near-side front mudguard and in a prominent position on the rear of the vehicle" I assume the near-side is the curb side and the far-side is toward the middle of the road. Remember, the Brits drove on the left. Canadians drove on the right. and the Poles drove wherever they felt like driving - usually at high speed.
The K&C insignia placement does not comply and in fact has the symbols on opposite sides front vs rear instead of the same sides as it should, even not taking into account near-side vs far-side.
However - there are loads of variations and exceptions so there is a "correct" placement but no wrong placement. I'm just happy the correct symbols are used.
Terry