Prince Harry: 'My brother and Kate will run marathon next year'
22 April 2012 Last updated at 12:55 BST
Prince Harry has told the BBC's Sue Barker that Prince William and his wife Kate will run the London Marathon in 2013.
But a Clarence House spokesman said the royal couple had no firm plans to enter, adding Harry's comments "were said in jest".
Speaking from the finish line, he admitted he had never run the race himself but often watched it.