Princes William and Harry are due to begin their first joint overseas tour in Botswana later. Prince Harry travelled to the African nation ahead of his brother for a six-day visit that will see them visit Botswana, Lesotho and South Africa. In the first two destinations the royals will visit their charitable interests, while during their final stop they will watch England's World Cup match against Algeria and promote the Football Association's bid to host the tournament in 2018. Harry said he regularly spends time privately in the nation, famed for its nature reserves and spectacular scenery, and confessed his time away from home is worrying his father Prince Charles. Harry was guest of honour at a garden party at the official residence of High Commissioner Jennifer Anderson to mark the Queen's official birthday. After being introduced by diplomats, the prince told the guests: "The fact that I spend more time here than at home worries my father a lot."