I am building the Airfix Morris CDSW Bofors gun Tractor (depicting it as a BEF vehicle). The kit's bridging plate shows a white number '20' on a black disc. Is this correct? I was under the impression that vehicles towing AA or artillery equipment would have had two numbers on the bridging plate ...

For those who have a similar query, I have found the answer.
Evidently, the Bridging Plate would show 7 over 6, but often just the 6. It was also quite common for the yellow disc to be fitted, but without any number at all. I totally misunderstood the Airfix kit decal ... the 20 referred to the vehicle's maximum speed, and was displayed at the rear.

Paul