"Made by the Rootes group, the Humber was essentially a combination of the Karrier KT 4 artillery tractor chassis and the armoured body of the Guy Armoured Car. The first order for 500 was placed in 1940. Production started in 1941 and a total of about 3,652 units were produced by the time production stopped in 1945. Over half of them were the 37 mm gun-armed Mk IV.

The vehicle was used in the North African Campaign from late 1941 by the 11th Hussars and other units. It was also widely used in the European theatre by reconnaissance regiments of British and Canadian infantry divisions. A few vehicles were used for patrol duty along the Iran supply route. The Humber armoured car was also used in Burma.

A captured vehicle (a MkIV) was used by the Aufklдrungs Abt of the 9th SS Panzer Division Hohenstaufen at Arnhem[1].
After the Second World War, the Humber was employed by Egypt in 1948-49 as well as by Burma, Ceylon, Cyprus, Denmark, Mexico, the Netherlands, Portugal.

Several static and operational cars are distributed through North America and Europe. There is a Mk I on display at the Bovington Tank Museum.
However, to the great regret of many modern day collectors and enthusiasts, most of the British Army's remaining Humbers ended up on firing ranges to be used for target practice in the years following their removal from service."

Courtesy of wikipedia.org