The scene is Trafalgar Square, London. Difficult to date, possibly early post WW11. The bus is an AEC ( Associated Equipment Company ) who went on to manufacture the Routemaster - the iconic red London bus known the world over. The model shown is possibly an STL2077 manufactured from 1937 to 1950. The taxis are the well known Austin 12/4s of which there were thousands. As regards the seeming chaos, snow notwithstanding!, well nothing changes - it is much the same today but a hundred times worse!