Hanno, no...that was the 30-cwt Armoured A/tank truck designed as such....what I am after is the flame-thrower - equipped trucks as used by the RN, and also armoured personnel trucks [armoured rear bodies].
Here's another oddity...these must have been converted OY trucks but I can't read the census number and can't find any reference in the Census Book either.
http://www.britishsoldier.com/early.htm