Weird armoured Bedford

[David_Hayward (RIP)]

The official caption suggests that the same design was used on Leyland, AEC and Bedford chassis. The AEC I think was the Cockatrice Heavy [but the body whilst similar was NOT identical], but I am beginning to really think that the wartime censor has just grabbed a representative shot showing 'airfield defence' vehicles, and that the Bedford truck was the QL Cockatrice. That said I have found evidence of a Bedford OY SP gun in a turret on top of an armoured [pea-shingle?] box body. These were used by the Home Guard, apparently and had a 3-pounder gun. Has anyone got an official shot of a Bedford OY armoured truck?