When were the first Universal pattern Bren gun carriers fielded? I know that the BEF 1st Armored Brigade elements were equipped with the 4 earlier specialized varients of the Bren carrier, but what about the Regiments of the British 1st Armored Division that were partially deployed around Calais while the rest of the BEF, French, Belgians, and anyone else caught in the pocket were falling back on Dunkirk.
I have about a half-dozen Airfix 1/72 Bren/Universal carriers, and I haven't been able to nail down a clear answer. The earliest solid reference I've found to Universal carriers so far is with British units in Greece and then North Africa.