According to Bart Vanderveen's excellent book on pre-war vehicles, such armoured tenders were built on the RR Silver Ghost chassis beginning in 1917 with single rear wheels and in 1921, upgraded to dual rears.
Not being a researcher on armoured subjects, I don't know much about them.
However, during the Palestine/Arab conflicts of the late 1930's, they re-appeared in the configuration shown in your photos, upgraded once more with modern pneumatic tyres of a larger size.
I have found one photo in my files, appended here, and it looks like a sister to yours with a very close registration number. I will continue to look for these tenders "in the background" in some of the many other Palestine conflict photos in my files.
I also have a fair amount of similar Ford Tender photos and even a couple of Israeli CMP home made A/Cs after 1948 if it is of interest to the group.
Bill
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