dunno, but there are loads
Keith adds. If you mean the traditional looking AEC Routemaster (and similar makes) traditionally associated with London, then there are only six left running. These are on specific tourist routes. AEC, Daimler and other bus makers stopped the traditional D.D. bus in the 1980s. They were slowly phased out and replaced with D.D. buses seen everywhere slse such as Scanias, Volvos Etc. The current Mayor, Boris (weird last name) commissioned a new 'traditional D.D. Bus in 2010. It was recently released and loks nothing like the traditional bus. It does have a rear platform but that's it. The winning design did actually look like the old buses but it was 'modified' and looks like (in my opinion) crap.
Red
So they can be more easily spotted and recognized as buses in traffic.
red
Usually London buses are red. Although I think you know the answer because you stated it in the question.
The female voice of the red London buses that records the annoucments and the bus stops comes from Emma Hignett. Emma Hignett put herself forward to record the annoucments in the red London buses, they are still heard today.
Red Bus offers a bus service in Australia. Confusingly the buses in London are also red buses and people often refer to them as the red bus service but in fact they are operated by Transport for London.
daimler
'Double-decker' buses have been used in London since the days of horse-drawn buses. Red has been the accepted colour of London's buses since 1933 and the famous 'Routemasters' with the rear boarding platform first entered service in 1956.
About 8000
1956
The red London bus (Routemaster) is 2.52 metres wide.
London Buses was created in 1999.