Thank you for the all replies and information.
The only other photo's only show enough to confirm that they also had these panels, but not any detail. I wasn't aware of its existence before so hadn't looked for evidence of it, but now I know what to look for it can be seen on other trucks. Its in a rather awkward position for being caught on camera, often obscured by stowage, crew and shadows.
I've email the Royal Signals Museum with the same information but they are shut due to Covid until next year.
So its most likely a charging panel (makes sense), but not a known version. Most likely had some of the same fittings re-arranged on a smaller panel to fit in the cramped location. It allowed the battery to be charged and the radio to be powered by the dedicated battery on the running board , or the truck battery (same voltage?), or isolated for transport?
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