Although we are mainly interested in motor cycles and sometimes ones without engines..... have a look at http://www.old-bus-photos.co.uk/?tag=sunbeam-sikh for a bus supplied to a London operator. How about the comments then. Sunbeam was in fact better known at that time for Trolley buses.
Cheers
Vic
With those open cabs they must have been about as cold as a motorcycle for the driver. My grandfather was a bus driver for the Ortona Company in Cambridge in. The 1920s / 30s and prior to that rode a Sunbeam combination delivering something (we know not what) to someone (we know not who). I have somewhere a photo of him on the Beam - which I cannot find. When it turns up I'll send it to Steve for the mag.
Steve.