What is red but green, open but closed and old but new? Answer: London's stunning new double-decker buses.

The traditional red double-deckers are a symbol of London. Their iconic status was sealed in 2008 when one bus made the longer-than-usual trip to Beijing to collect a very special passenger: the Olympic Flame.

Now a new bus design has been unveiled and it has been wowing Londoners.

The new bus uses more efficient green technology and has two staircases and an open platform, enabling people to hop on and hop off. It also has a unique asymmetric design for the front end, which gives it a futuristic look.