How will police keep safe the nearly one million spectators who will be lining the London streets on Friday for the Royal Wedding?
Roy Ramm, former commander of specialist operations at New Scotland Yard, shares how security is preparing for the big day, how the weather will affect screenings, and how they will react if a disruption occurs.
The planning, Ramm tells AM's Kiran Chetry, has been going on for months. He explains the precautions taken and who police have already pre-screened as potential disruptors.