From my Archive I choose AEC…
Makers of London’s RT and Routemaster buses they also supplied vehicles to other UK operators and across the world.
First I present a Reading Transport example of a Regent with the traditional tall AEC radiator…
Reading Corporation 304
And to follow, an example of an AEC Regent V with the later square radiator design in service with Devon General…
Devon General 510
A lively bit of cornering 
