When Nissan introduced us to its modern interpretation of London's black cab more than a year ago, the compact diesel was all but ready to hit the city's streets. However, the Japanese automaker decided it wasn't quite finished with its final design, so it headed back to its London studios with feedback from the London Mayor's office to make it little more, well, iconic. Earlier today, Nissan unveiled the updated version of its NV200 Taxi for London, highlighting its new round headlights and a re-modelled grille in an attempt to mirror the black cabs of old. The new model also ditches diesel for a cleaner 1.6-liter petrol engine and uses LED lights to improve visibility of its orange-lit taxi sign. Nissan says the petrol-engine NV200 will go on sale in December, serving as a key "stepping stone" for zero emission electric version, which could become the capital's first all-electric taxi in 2015.