Prince Harry and Meghan Markle are preparing to marry in a ceremony that will be watched by millions of people around the world.

The couple - the new Duke and Duchess of Sussex - will wed from noon at St George's Chapel in Windsor Castle before travelling through the down in an open-topped carriage.

Huge crowds are gathering in Windsor, with hundreds of die-hard royalists - many decked out in the national colours of both Britain and the United States - having camped out overnight to secure the best views.Senior members of the Royal family and a raft of celebrities will be among the 600 invited guests and another 2,640 members of the public have been chosen to watch the ceremony from the grounds of Windsor Castle.