Alas Don't have a No12 control unit Tim. The closest I have is a No16 unit as per the attached picture.
Also attached for reference is a picture of a couple of remote control junction boxes. They connect to the remote control box inside the turret via the two wire terminals on the end (and the wiring held on the external cable drum of course). Presumably these were kept in a signals satchel along with a headset for use when someone left the vehicle.
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