London and into the Home Counties with a branch to Heathrow Airport. It is Europe's biggest construction project, with a £15 billion projected cost. London is the centre of the National Rail network, with 70 per cent of rail journeys starting or ending in London. Like suburban rail services, regional and inter-city trains depart from several termini around the city centre, linking London with the rest of Britain including Birmingham, Brighton, Reading, Bristol, Cardiff, Derby, Exeter, Sheffield, Southampton, Leeds, Liverpool, Manchester, Cambridge, Newcastle upon Tyne, Edinburgh and Glasgow. Some international railway services to Continental Europe were operated during the 20th century
London Biggin Hill Airport be called into question. However, in 1958 Biggin Hill ceased to be an operational RAF station, becoming the Officer and Aircrew Selection Centre for the RAF. Due to the impending closure of the nearby original London Airport at Croydon, from 1956 much of the civilian light aviation from Croydon relocated to Biggin and it became a joint civilian and military airport. Croydon closed completely in 1959, at which time Biggin Hill became a mainly civilian airport with only occasional military flying taking place. The base was also used by the following RAF Regiment squadrons: Towards the end of 1963, the