At most royal weddings, all guests are told exactly where to sit and Beatrice will probably enforce a seating plan.
What’s more, those at the wedding are asked to stay in their seats and cannot leave during the service.
The royal wedding will have an official start time but guests must arrive at least an hour before this.
Speaking on Meghan’s wedding, Duncan Larcombe, former royal editor, told Cosmopolitan: “You don’t want to turn up after [the Queen]. She will get there five minutes before Meghan will arrive.”