On April 29 2011, more than two billion people around the globe tuned in to watch as Prince William married his long-term girlfriend, Kate Middleton - the first commoner to wed a future British king in 300 years. Ten years on, The Day Will and Kate Got Married celebrates that momentous day through the memories of family, friends and insiders who played a part in it, including Kate's uncle, Gary Goldsmith, speaking exclusively in his first ever TV interview, and former Metropolitan Police commander Bob Broadhurst, who was in charge of security against a background of a violent, divided Britain. The documentary casts a fresh eye over the couple's courtship, at how they are modernising the monarchy and looks towards the future, and how they are preparing for their future roles as Britain's King and Queen.