Prince Harry has been criticised after presenting an award in Las Vegas, just days after King Charles was diagnosed with cancer. The Duke of Sussex visited the UK on Tuesday in a whirlwind 11,000-mile round trip to visit his father, following the announcement. The Prince met with the King in a reunion which lasted “a maximum of 45 minutes”, according to royal insiders. As the King and Queen travelled to Sandringham, Prince Harry flew back to his California home the same evening as he prepared to present an award in Las Vegas. The Duke of Sussex presented the NFL Walter Payton Man of the Year a…