The Great British Rail Sale has started with over 1 million journeys slashed by as much as half. The promotion only applies to tickets for travel from 25th April to 27th May 2022, with tickets available to buy until 2nd May 2002. Between this period, tickets from Cambridge to London Liverpool Street can cost as little as £4 for a single journey. Tickets covered by the sale include routes in England, Scotland and Wales.  For more information, visit here.