The 1·6 km twin-bore tunnel at Long Itchington Wood is among the most well advanced of HS2's many underground sections. Chris Howe reports from the site in Warwickshire.
Tube journeys on the Piccadilly Line from London Heathrow to London King's Cross take just over an hour. While the HS2 link to Birmingham would be quicker than journeys on the tube to Heathrow ...