The BSA prototype was completed in September and handed over for testing. By December, it had covered on- and off-road with few mechanical problems. Policy from the War Office changed to a requirement for an armoured roof. The BSA vehicle needed a more powerful engine and strengthened suspension. It was chosen over the Alvis and the first order (172 vehicles) for the "Car, Scout, Mark I" was placed in May 1939. The actual production was passed to Daimler, which was a vehicle manufacturer in the BSA group of companies.