Catherine, Duchess of Cambridge walks with Ben Ainslie (centre) and Charles Dunstone, co-founder of Carphone Warehouse, during the launch of the British challenger team for the America’s Cup, at the National Maritime Museum in London yesterday. Sailor Ben Ainslie will lead an £80mn British challenge for the 35th America’s Cup in 2017, aiming to return sport’s oldest trophy to his country for the first time.