The Duke and Duchess of Cambridge have released footage of them playing with their children. A 39-second video posted on their official Twitter account shows the couple and the three youngsters enjoying time together, including walking in the countryside and playing on a beach. In a message accompanying the video, the couple, who are celebrating their 10th wedding anniversary, thanked those who had sent “kind messages”, adding: “We are enormously grateful for the 10 years of support we have received in our lives as a family.”