Given the recent interest in Royal Navy vehicles I thought this might interest some others as well. The answer to this puzzle was supplied by my good friend Mick Bell who located this image
which is accompanied by this description: THE ROYAL NAVY DURING THE SECOND WORLD WAR Officers on the island of HMS SPURIOUS MARK II a dummy aircraft carrier island at Royal Naval Air Station East Haven at Carnoustie, Scotland. The interior of the single decker bus which forms the basis of the "island" has been fitted with a chart desk, lockers and stowage for chocks.
Fyll