Not valid on the Heathrow Express, Eurostar, or some busy weekday morning commuter trains. Allows unlimited bus travel in England, Scotland and Wales on the extensive National Express bus service. While many small towns and rural areas of Britain are not served by trains, travelers can go anywhere just about any time by coach. Coach travel is the cheap way to explore Britain. While some argue you get a closer look at Great Britain through a bus rather than a train window, I'd bus Britain only to save money and to fill gaps in the train system.
Many buses are ideal for daytrips from London.
See student guidebooks for similar bus deals covering Scotland and Wales. Round-trips are a bargain. The fastest and most convenient way to get from Big Ben to the Eiffel Tower is by rail. First class prices include a classy meal. You can book Chunnel tickets at any major European train station.