Shortly, the Queen's coffin will be transported to Westminster Abbey where her state funeral will be attended by some 2000 guests.

Britain and the world are laying Queen Elizabeth II to rest at a state funeral that will draw presidents and kings, princes and prime ministers — and up to a million people lining the streets of London to say a final goodbye to a monarch whose 70-year reign defined an age.

A day packed with funeral events in London and Windsor began early when the doors of 900-year-old Westminster Hall were closed to mourners after hundreds of thousands had filed in front of her coffin since September 14.

Many of them had spent cold nights outdoors to pay their respects around the queen's flag-draped coffin in a moving outpouring of national grief and respect.

READ MORE: First guests take their seats in Westminster Abbey for Queen's funeral

The closing of the hall marked the end of more than four days of the coffin lying in state and the start of the UK's first state funeral since the one held in 1965 for Winston Churchill, the first of 15 prime ministers during Elizabeth's reign.

Two days before her September 8 death at her Balmoral summer retreat, the queen appointed her last prime minister, Liz Truss.

The last member of the public to view Queen Elizabeth II's coffin as it lay in state at the Houses of Parliament was Chrissy Heerey, a serving member of the Royal Air Force from Melton Mowbray.

Heerey said "it felt like a real privilege to do that".

She said Monday she went through Westminster Hall twice — the first time in the early hours of the morning and then again just before its doors closed to mourners at 6:30am.

READ MORE: King Charles III 'didn't get involved in preparations for him to become King'

She said the experience was, "one of the highlights of my life and I feel very privileged to be here".

Monday was declared a public holiday in the UK in honour of Elizabeth, who died September 8 at 96.

In Australia, a public holiday will be observed on Thursday. The day of mourning takes place once the Prime Minister returns from the funeral in London. 

Her funeral will be broadcast live to more than 200 countries and territories worldwide tonight, and screened to crowds in parks and public spaces across the UK.

Police officers from around the country will be on duty as part of the biggest one-day policing operation in London's history.

Prince William and his wife Catherine's nine-year-old son Prince George and seven-year-old daughter Princess Charlotte will attend.

George, who is now second in line to the throne, and his sister will walk through Westminster Abbey with the royal family in procession behind the queen's coffin as it is carried by pallbearers Monday.

The funeral's order of service showed that George and Charlotte will walk together behind their parents.

They will be followed by Prince Harry and his wife Meghan, the Duchess of Sussex, and other royal family members.

The royal children's four-year-old brother, Prince Louis, is not expected to be present at the funeral, which will be attended by some 2,000 people.

On the evening before the funeral, King Charles III issued a message of thanks to people in the UK and around the world, saying he and his wife Camilla, the queen consort, have been "moved beyond measure" by the large numbers of people who have turned out to pay their respects to the queen.

"As we all prepare to say our last farewell, I wanted simply to take this opportunity to say thank you to all those countless people who have been such a support and comfort to my family and myself in this time of grief," he said.

For the funeral, Elizabeth's coffin will be taken from Westminster Hall, across the road to Westminster Abbey, on a royal gun carriage drawn by 142 Royal Navy sailors.

The same carriage was used to carry the coffins of late kings Edward VII, George V and George VI, and of Churchill.

The service, in the Gothic medieval abbey where Elizabeth was married in 1947 and crowned in 1953, will be attended by 2000 people ranging from world leaders to health care workers and volunteers.

READ MORE: Prince George, Princess Charlotte to attend great-grandmother's funeral

Mourners started arriving to take their seats shortly after 8am local time (6pm AEDT).

Dignitaries were arriving later, with many heads of state gathering at a nearby hospital to be driven by bus to the abbey.

The funeral will end with two minutes of silence followed by the national anthem and a piper's lament, before the queen's coffin is taken in a procession ringed by units of the armed forces in dress uniforms, with the queen's children walking behind, to Wellington Arch near Hyde Park.

There, it will be placed in a hearse to be driven to Windsor for another procession along the Long Walk, a five-kilometre avenue leading to the town's castle, before a committal service in St George's Chapel.

She will then be laid to rest with her late husband, Prince Philip, at a private family service.

Central London was already packed before dawn Monday with people seeking out a prime viewing spot, and authorities warned that it would be extremely busy.

READ MORE: Who will be at Queen Elizabeth II's funeral?

US President Joe Biden was among leaders to pay their respects at the queen's coffin on Sunday as thousands of police, hundreds of British troops and an army of officials made final preparations for the funeral — a spectacular display of national mourning that will also be the biggest gathering of world leaders for years.

Biden called Queen Elizabeth II "decent" and "honourable" and "all about service" as he signed the condolence book, saying his heart went out to the royal family.

People across Britain paused for a minute of silence at 8pm on Sunday in memory of the only monarch most have ever known.

At Westminster Hall, the constant stream of mourners paused for 60 seconds as people observed the minute of reflection in deep silence.

In Windsor, rain began to fall as the crowd fell silent for the moment of reflection.

Some set up small camps and chairs outside Windsor Castle, spending the night there to reserve the best spots to view the queen's coffin when it arrives.

"It will all be worth it by 4 o'clock this afternoon," said Sally McCloud, a business manager from nearby Maidenhead.

"We're all here for one reason, whether it be raining or not raining. So I'm quite happy to be here and got a little bit of sleep. I've had a nice cup of coffee this morning and we'll just wait, wait in the rain."

Fred Sweeney, 52, who kitted out his spot with two Union flags on large flagpoles, said "it's just one night and day of our lives. Elizabeth gave us – you know – 70 years."

One no-show for Monday's funeral will be Saudi Crown Prince Mohammed bin Salman, whose invitation drew criticism from human rights groups because of the killing of journalist Jamal Khashoggi inside the Saudi consulate in Istanbul in 2018.

Saudi Arabia is expected to be represented by another royal, Prince Turki bin Mohammed.

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King Charles III's former press secretary has revealed he stayed out of preparations for him to become King throughout the years because they meant "contemplating the death of his mother".

Speaking to 9News outside Windsor Castle, Kristina Kyriacou, who worked as the King's communication secretary and special adviser from 2009 to 2017, has said King Charles III never got involved in planning for his reign.

"Of course, during that period, behind-the-scenes we were all leading up to this moment," she said.

LIVE UPDATES: Final mourner attends Queen's lying-in-state

"And he never got involved in that – because it meant contemplating the death of his mother.

"He was very much in the background," she said.

Kyriacou went on to say she thought the grieving new King had been given strength by the public's support.

"He has always gained strength from the members of the public," she said.

"His grief has been assuaged somewhat by the amount of support he has received all over the world for the job he is doing."

"Today will be a day laiden with grief, and after today is when he will start to take stock of the responsibilities and the new role that he is assumed."

Planning has been underway for the Queen's death for 40 to 50 years according to royal commentator Dickie Arbiter.

READ MORE: Who will be at Queen Elizabeth II's funeral?

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The NSW Government is warning NRL fans seeking finals tickets to avoid dealing with reselling platforms who are auctioning off tickets for profit, in violation of the state's laws.

Recent data collected by NSW Fair Trading revealed a single ticket to the National Rugby League grand final in Sydney on October 2, 2022 was being offered at 49 per cent above the original price of a ticket in the same section on a reselling website. 

NSW Fair Trading Commissioner Natasha Mann is calling on Aussies to find other ways of securing tickets to popular events. 

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"In NSW, ticket sellers are prohibited from reselling a ticket for more than 10 per cent above the original price for an event held in the state," Mann said.

"Corporations found breaching ticket reselling laws can be fined up to $110,000, while individuals can be fined up to $22,000.

"If a ticket is sold for more than the allowed cap, the event organiser may cancel the ticket and refuse entry to the person who holds it."

The major Australian ticket reselling websites to avoid are Viagogo, TicketmasterResale and StubHub, which tend to advertise tickets for hundreds of dollars more than the original price. 

In one example of a recent transaction made through a ticket reselling website, a consumer had paid $977 for two tickets to Robbie Williams when the face value of the tickets were $198. 

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"Frustrated consumers have also contacted NSW Fair Trading with complaints about fraudulent or fake tickets, of tickets being purchased but not delivered and delays receiving a refund for cancelled events," Ms Mann said.

"NSW Fair Trading conducts regular compliance activities in relation to the reselling of tickets for events in NSW.

"Consumers should avoid dealing with ticket resellers in order to avoid disappointment."