London City Tour is the sightseeing tour bus Hop On Hop Off in London, which offers open roof, either completely or only half and the ability to get on and off the open top bus as many times as you want.
24 or 48 hours to explore London
Hop-on hop-off service
Audio guide in 10 languages
Seven routes to enjoy
One way river cruise from Westminster Pier to St. Katherine's Pier or vice versa