Along with the red Routemaster bus, the other instantly recognisable symbol of London and British public transport is the black cab. I can practically guarantee what you're now thinking of will inevitably be the Austin FX4 or Carbodies Fairway as it later became, a classic design that roamed the streets of the capital and many other areas in huge numbers for decades.
The FX4 wasn't the only bespoke taxi designed specifically to meet London's peculiar requirements though; its main rival may be much less famous and doesn't have the same quintessentially British image but carved out a formidable reputation among cabbies and gave many years of reliable service so I have nominated it as this month's unsung hero. I'm talking about the Metrocab, a vehicle that was an excellent taxi in own right but is very much overshadowed by the iconic nature of the FX4 so it rarely gets the recognition it deserves.