 The prince is expected to attend without his wife, the Duchess of Cambridge, and their three children Prince George, Princess Charlotte and Prince Louis, and fly in to interview the naturalist about his work
 The interview will begin at 1.15pm (GMT). Kensington Palace said the gathering between the royal and Sir David, 92, will focus on the “urgent challenges facing the next generation of environmental leaders”
 The Duke of Cambridge’s visit comes less than 24 hours after Sir David was presented with the coveted Crystal Award for his leadership in environmental stewardship
 Accepting the award, Sir David yesterday urged world leaders to come up with "practical solutions" on the environment
 He added: “We can create a world with clean air and water, unlimited energy and fish stocks that will sustain us well into the future
 But to do that, we need a plan.” Prince William has long been a keen environmentalist having launched a wildlife crime campaign four years ago to stigmatise buying of ivory and rhino horn
  The United for Wildlife group, which he founded with retired footballer David Beckham, used the hashtag #WhoseSideAreYouOn to use the power of sport and social media to tackle illegal hunting
 His visit to Switzerland comes amid a week of trouble for the Royal Family. His grandfather, Prince Philip, was involved in a shock car crash that saw the 97-year-old’s Land Rover flip on its side near the Queen’s Sandringham estate in Norfolk
 The Ford KA also involved had two women and a nine-month-old baby inside. Emma Fairweather broke her wrist as a result of the crash
 The Queen has since wished her well but Ms Fairweather criticised the Duke of Edinburgh for not apologising after the incident
  Norfolk Police are investigating, and the duke was said to have passed a breath test at the scene of the collision
 Though 48 hours after the crash, he was photographed leaving Sandringham in a brand new luxury car and not wearing a seatbelt
 This prompted officers to make contact with him a second time.  
