This is right. Generally, rail dominates air for journeys of up to three hours, and is competitive up to about 5. Many of the domestic air routes (and closer in

This is right. Generally, rail dominates air for journeys of up to three hours, and is competitive up to about 5. Many of the domestic air routes (and closer international routes like London to Paris) are really only for people connecting onto long-distance flights rather than a popular way of going city-to-city. The more general-purpose flights are either longer (London to Scotland, or Exeter to the North) or over water (mainland to NI, for example). The main competition for medium-distance routes is absolutely road, which has the majority share (cheaper, but normally slower on the main intercity trunks).