Thousands of people are expecting to shuffle in a moving queue for hours to pay their final respects to Queen Elizabeth II when her body arrives at the Palace of Westminster in London.
Operation Unicorn is transporting the Queen's body from Balmoral to Westminster where the royal family will attend a service on Wednesday afternoon, local time.
The Queen's closed coffin will then be in Westminster Hall where members of the public will be able to visit, for four days until the morning of the state funeral.
