British troops have a window of just 48 hours to evacuate civilians from Afghanistan, according to a former defence chief, if they are to withdraw by the Aug. 31 deadline. Speaking to the Telegraph, Lord David Richards said he was he is “pretty certain” that logistics allow only two more days for civilian rescue efforts to give time for the British military themselves to pull out. The former Chief of the Defence Staff, however, said he was sure that they would continue to “sneak others in who arrived late along with their own people.” The assessment follows yesterday’s G7 meeting in which allies failed to convince U.S. President Joe Biden to keep U.S. troops—who are securing  Kabul airport—beyond the deadline. Before the G7 meeting, the Taliban had again warned that they would not tolerate foreign troops past the deadline, and said that they were tightening their grip on the streets around the …