After a quarter of a million passengers had their flights cancelled or diverted by the shutdown of London Heathrow, the airport’s chief executive is facing questions from MPs. Thomas Woldbye is appearing before the Transport Select Committee today (2 April) to explain the sequence of events that led to more than 1,400 flights being diverted or cancelled. A fire broke out in a transformer within an electrical substation in Hayes, north of Heathrow, late in the evening of Thursday 20 March. In