The King and Queen said goodbye to Kenya in local style – posing in a tuk-tuk used by commuters on the streets of Mombasa.Charles and Camilla ended their first tour of a Commonwealth country since the King’s accession with a flurry of royal engagements in torrential rain, and outside the Kenyan city’s historic Fort Jesus they sat in the three-wheel vehicle.In keeping with Charles’s belief in sustainability, the tuk-tuk was electric, and with the ministerial jet a few miles away the King quipped to the press flying on his plane: “Maybe we can use this to get to the airport.”As the King and Queen posed in the tuk-tuk, Camilla was told the three-wheeler had a top speed of 60kph and she smiled.And when the driver Eunice Karanja accidentally started the vehicle Charles threw up his hands and grinned.Tuk-tuks, a reference to the sound of its petrol engine, are used widely across Kenya with trips usually costing less than a pound.