A common sight in central London are tour buses, the majority being open-top buses. These are double-decker buses with a fully or partially open upper deck, which provide tourist services with either live or recorded commentary. Most of these services allow passengers to embark and disembark at any of the company’s stops, continuing their journey on a later bus.
There are several competing operators of such services which do not form part of the London Buses network and do not issue or accept London Buses tickets, although at least one paints its buses in the same red as London’s local buses. Fares are set by the operators, usually a flat fee for a day’s (or multiple days’) usage; there is no need to pre-book and tickets can be bought from the driver or bus-stop ticket sellers.
Other more formally organised tours use luxury coaches and generally need to be booked in advance through travel agents.