Ticket includes hop on hop off service with over 90 stops on 6 different routes tickets valid for 24 hours free walking tour worth 10 voucher valid for one day free river thames boat ride worth 680 see a number of attractions including buckingham palace tower of london st pauls cathedral tower bridge trafalgar square piccadilly departs approximately every 15 20 minutes and every 5 10 minutes from the main tourist points live english or multilingual audio guide aud