Interesting that it was the Royal Naval Air Service that raised the first armoured car squadron during WW1 and the British Admiralty that designed the Rolls Royce Mk.1 1914 Pattern Armoured Car primarily for rescuing downed RNAS pilots behind enemy lines.
At first these were built on chassis of requisitioned RR Silver Ghosts but ultimately on new factory supplied units. Around 120 were built during WW1. The RNAS also approached Lanchester which produced a further 36 vehicles of a 4x2 model, not to be confused with the 6x2s used in Malaya.
These early armoured cars were not suitable for the muddy conditions in Europe and most were sent to sideshow areas of conflict like the little war in German South West Africa in March 1915. See: