In the 35 odd yrs I've been around GPO/PO Minors, this feature has
eluded me.
Would you please e-mail me photos of the vans you mention, better
to arrive at a satisfactory conclusion. Have you removed this panel to
determine whether fitted after the top-coat?
If I'm wrong, I will accept it - FACTS are all important in research!
I have no idea what you refer to regarding the last subject you raised.
Further investigations uncovered it was an inside job!!