This photo was taken at Millwall Dock in the 1960s. The bus being loaded on to the ship is a Routemaster, one of the most iconic sights to be seen in post-War London. Wiki has a very extensive entry on the bus (here). The technology that went in to the design of the bus was, for its day, cutting edge.
London’s Mayor, Boris Johnson, decided hold a competition for the design of a new Routemaster. You can see photos of Routemasters old and new here.