The Queen arrives at the Royal wedding

The Queen's arrival at St George's Chapel for her grandson's wedding marked a key moment in the day's proceedings: that the entire guestlist were now present at the venue. Tradition dictates that Her Majesty is the last to arrive at Royal engagements, visits and events – and the protocol even extends to her family's weddings.  She will watch Meghan Markle walk down the aisle to royalty and an awaiting Prince Harry. And guests will have to be on their guard for