In 1940-50 the bham hospital contributary association ran the bham ambulances including Morris, Dennis,Austin, Vauxhall, Commer,Chevrolet!The fire service took over when the NHS started and used Humber,Austin and Daimler and some army austin K2 ambulances I drove many as a St. John volunteer.
I just tried to access this link that Alf posted but it did not work as the site has undergone some work since Alf posted this. Here is the updated link that I 'grabbed'. Some interesting stuff for those interested in the subject.
When I started on service in 1970s,We had the Bedford Ambulance.It was only the Reds that had the blue lights and two tones.They were adding blue lights to some of the older Ambulances,but they still had the bell on the front.Remember the new infux of Ambulances being delivered,They had the cots in the back instead of the stretchers,Cannot remember exactly the name of the company that carried out the outfitting of vehicles thing something like Hanlon,