Mourners are arriving at Westminster Abbey for Queen Elizabeth II's state funeral, with members of the royal family and world leaders among 2000 people expected at the ceremony.

Crowds of mourners have flocked to London, Windsor and royal sites throughout the United Kingdom on the national bank holiday, with the service set to draw millions of TV viewers across the globe.

All public viewing areas for the funeral procession in the capital were full by 9am on Monday.

Overnight, the final members of the public queued to see the Queen lying in state in parliament's Westminster Hall before her coffin is moved to the nearby abbey.

The day marks the climax of what is being regarded as the biggest security operation the UK has ever seen, surpassing the operation for the Platinum Jubilee weekend and the London 2012 Olympics, which saw up to 10,000 police officers on duty per day.

The royal family will walk in procession behind the Queen's coffin as it is carried through the Gothic church by the military bearer party.

The King and the Queen Consort will walk immediately behind the coffin, followed by the Princess Royal and Vice Admiral Sir Tim Laurence, the Duke of York, the Earl and Countess of Wessex, and the Prince and Princess of Wales.

Prince George and Princess Charlotte will walk with their parents side-by-side in formation, followed by their uncle and aunt the Duke and Duchess of Sussex and other members of the royal family.

The service follows the Queen's lying in state period at Westminster Hall, which ended at 6.30am.

The Queen's coffin will be taken in a grand military procession from the Palace of Westminster to Westminster Abbey for the funeral at 11am.

Before the service, conducted by the Very Rev David Hoyle, Dean of Westminster, the tenor bell will be tolled every minute for 96 minutes, reflecting the years of the Queen's life.

Heads of state, prime ministers and presidents, members of European royal families and key figures from public life will gather at the abbey.

But invitations were not sent to Russia and Belarus due to the invasion of Ukraine, while Taliban-ruled Afghanistan, Myanmar's military junta and Syria's Bashar Assad were also excluded.

At 12.15pm, the coffin will be taken in procession from Westminster Abbey to Wellington Arch and then travel to Windsor.

The hearse will then travel in procession to St George's Chapel at Windsor Castle via the Long Walk, after which a televised committal service will take place in St George's Chapel at 4pm. This will conclude with the crown, orb and sceptre - symbols of the monarch's power and governance - being removed from the coffin and placed on the altar.

Later in the evening, in a private family service, the coffin of Elizabeth and her husband of more than seven decades Prince Philip, who died last year aged 99, will be buried together at the King George VI Memorial Chapel, where her parents and sister, Princess Margaret, also rest.

© AP 2022