Is that a 2-pounder on your roof?
Here we see a Canadian Army Daimler Armored Car in France during WWII
Over 2600 of these hardy 13-foot long vehicles were built in WWII for the British and Commonwealth armies. Equipped with a 2-pounder (37mm) Quick-Firing gun, typically they carried 52 rounds for the main piece and some 3000~ for the coaxial machine gun and Bren LMG mounted up top when needed.
Powered by a 95hp straight-six, this little 4×4 has independent suspension and could run out to 50mph on paved hardtop. Used as late as the 1960s by Territorial Army units (the UKs version of the National Guard) they were largely scrapped after that, replaced by the equally well-liked Ferret.