Why has the vital expansion of Heathrow been delayed so many times over so many years?

Why has the vital expansion of Heathrow been delayed so many times over so many years?

Joining Iain Dale on Cross Question are the New Statesman's Oli Dugmore, the Daily Telegraph columnist Ella Whelan, Labour peer and former adviser to then-Chancellor Alistair Darling Baroness Catherine MacLeod, plus the social media Holocaust-themed content creator Dov Forman.