Presented by Julian Worricker. Air vs Rail. The Conservative party says it would scrap plans for a new runway at Heathrow to invest in a better north-south rail link instead. But would you rather see a third runway at Heathrow, a high-speed rail network, neither or both? With guests: Dr Alice Bows - University of Manchester. Roger Kemp - Professor of Engineering at Lancaster University. Baroness Jo Valentine - chief executive of London First.