Humber Scout Cars were the standard vehicles for dispatch riders of the Czechoslovak Independent Armoured Brigade's (C.I.A.B.G.) Headquarters Squadron, the Armoured Reconnaissance Squadron, later converted into the 3rd Armoured Regiment, and reconnaissance elements of the two original armoured regiments, where they were used particularly as liaison vehicles, connecting units around the Dunkirk perimeter. The C.I.A.B.G. had 26 Humber Scout Cars at its disposal.
Approximately 4,300 Humber Scout Cars Mks. I & II were built during the war, with a nearly fifty-fifty share between the two marks. The overall perception of this vehicle was not very good, particularly due to the thin armour and poor cross-country performance not only in comparison with the Daimler design, which had a good armour protection, shorter wheelbase and could be left in a hurry without any problems.