The big red bus

Without a doubt, this is the most famous bus anywhere in the world. AEC RT's and RM's were specifically designed for use in London, the RM probably being the most recognisable. The bodies were made at the AEC Park Royal coachworks, and were pretty much all aluminium, making them light and nimble. Drivers were particularly pleased with the fully automatic gearbox. There were/are other manufacturers of double decker buses, Daimler, Leyland, Bristol to name others, but the London Transport Routemaster is probably top of the tree.

The Daimler CVG6 was the bus of choice where I was born, and I do have a special place for it. The chassis was made in Coventry, the body I most liked was the Metro Cammel Orion (lightweight like the AEC RM), and it was powered by the ubiquitous Gardner 5LW/6LW coupled with a four speed pre-selector gearbox.