Several competing companies offer similar bus tours of London's sights. Tickets are usually valid for 24 hours and passengers can hop on and off at various attractions en route.

Offering three different 90-minute sightseeing routes, The Big Bus Company has departure points close to many of London's attractions.

Offering a free cruise on the River Thames, Original London Sightseeing Tours run various sightseeing bus tours, including a new Da Vinci Code route.