Get ready for another season of that interminable saga, Heathrow’s third runway. There was a lull during the Covid pandemic when the airport’s owners, despite winning permission from the supreme court in 2020 to submit a planning application, cooled their jets while they waited for passenger numbers to recover. Now the whole thing is back, courtesy of Rachel Reeves. The chancellor is reported to be preparing to use a speech next week to declare support for a third runway at Heathrow alongside wider airport expansion in the south-east. The best form of airport expansion is none at all, environmentalists (some