The ceremonial procession for the Queen Mother on Friday morning will stretch for half a mile and involve 1,600 servicemen and women.
In terms of pomp and ceremony, it will be bigger than the royal funeral for Diana, Princess of Wales.
The procession, from the Queen's Chapel at St James's Palace to Westminster Hall, will be a military spectacular with troops from four Commonwealth countries as well as Britain.
The Queen Mother's coffin, surmounted by her crown, will be borne on a horse-drawn gun carriage to Westminster where she will lie in state until her funeral the following Tuesday.
Senior Royals, possibly including the Princess Royal as well as the principal male members of the family, will walk behind the coffin from St James's to Westminster.
The gun carriage will be drawn by the King's Troop Royal Horse Artillery and escorted by military detachments from British and Commonwealth regiments associated with the Queen Mother during her long life.
She was Colonel, Honorary Colonel or Colonel-in-Chief of more than a dozen regiments and units.
Members of the public will be able to pay their respects at Westminster Hall on Friday from 2pm to 6pm and from Saturday to Monday from 8am to 6pm.
On Tuesday next week, the coffin will be taken to Westminster Abbey for the funeral service.
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