Note that this is not a hop-on hop-off service, and there are no scheduled stops on this tour.

For greater independence, take the open-topped CitySightseeing bus (www.citysightseeing.co.za), a hop-on, hop-off service visiting many of the top attractions, with a recorded commentary on headphones.

The waterbuses provide a non-guided hop-on hop-off service along the entire harbourfront.

Busabout (08450 267514; www.busabout.com) has a hop-on, hop-off service for backpackers, good for Atlantic and Mediterranean France.

From 19 May to 19 August the same bus operates as a hop-on, hop-off all-day service for tours between 10am and 4pm.

In Vietnam, the network of 'open tour' buses which offer hop-on, hop-off services between, for example Hanoi and Ho Chi Minh City for around £30.