A hearing about Prince Harry's security arrangements is starting today in the Court of Appeal. The Duke of Sussex is appealing a ruling dismissing his challenge to the level of police protection he receives in the UK, and his case will be heard in front of three judges across Tuesday and Wednesday. The prince's dispute goes all the way back to 2020, and is one of several high-profile legal battles he has brought to the High Court in recent years. So what is the case about and what has happened in the courts so far? What is the dispute over?...