 In June 2007, the campaign group Greengauge 21 published a proposal for High Speed Two.It evaluated options for high-speed rail in the UK and recommended an £11bn route from London St Pancras and Heathrow to Birmingham and the North West, which they dubbed HS2.The report recommended the new line be built in the M40/Chiltern Main Line corridor, and used it as the basis for its findings.