President Biden and Jill Biden pay their respects as they view the coffin of Queen Elizabeth II as it lies in State inside Westminster Hall. [Photo: RNZ]

US President Joe Biden paid tribute to Queen Elizabeth on the eve of her state funeral, praising her dignity and dedication to service after he appeared at her lying-in-state in Westminster.

Biden is among the scores of dignitaries and royals from across Europe, Asia, Africa and the Americas who will attend Monday’s funeral. Hundreds of thousands of people have descended on London to pay tribute to Britain’s longest-reigning monarch, who died on 8 September aged 96.

“She was the same in person … as her image: decent, honourable and all about service,” Biden said after he signed a book of condolence. “Our hearts go out to the royal family.”

Biden earlier appeared on a balcony overlooking the queen’s coffin in the vast historic Westminster Hall, making a sign of the cross and briefly placing his hand on his heart in reverence.

Elizabeth’s body has been lying in state since Wednesday, and people from all walks of life and from around the country and overseas have queued for hours to file past her coffin in a constant, emotional stream.

The US president was joining King Charles and other leaders from around the globe for a reception on Sunday evening ahead of the grand state funeral

Biden was one of the 14 US presidents in office during the queen’s 70-year reign, of which Elizabeth met all except Lyndon Johnson, starting with Harry Truman in 1951 when she was still a princess.

He will join presidents, prime ministers, kings, queens and sultans representing nearly 200 countries and territories at the funeral.

French President Emmanuel Macron was seen walking near the River Thames earlier on Sunday, mingling with those gathered in the streets around parliament.

Liz Truss, who the queen appointed as Britain’s prime minister just two days before her death, took the opportunity to meet with leaders from Australia, New Zealand, Ireland, Canada and Poland over the weekend

Saudi Arabia’s Crown Prince Mohammed bin Salman, however, is no longer expected to attend, according to a British government source. Inviting the man Western leaders believe ordered the murder in 2018 of Saudi journalist Jamal Khashoggi had been controversial. He has denied any role in the killing.

Britain has invited heads of state or ambassadors from any country with which it has full diplomatic relations, but it is up to those nations who they send. The change was made by Saudi Arabia, the source added.

For all the high ceremony and careful diplomacy of the funeral, for the queen’s family, it is also when they will bid farewell to a mother, grandmother and great-grandmother.

Prince Andrew, the queen’s second son, paid tribute to “Mummy, Mother, Your Majesty” on Sunday, reflecting the roles he said Elizabeth fulfilled during her reign. “Mummy, your love for a son, your compassion, your care, your confidence I will treasure forever,” he said.

Andrew has fallen from grace, stripped of the “His Royal Highness” title and removed from royal duties after a scandal over his friendship with late US financier Jeffrey Epstein, a convicted sex offender, and a related sex assault allegation.

Andrew, Duke of York, has not been charged with any criminal offence and has denied any wrongdoing. He paid to settle a US civil court case.

On Saturday evening, his two daughters joined the queen’s other six grandchildren, including Charles’ sons Princes William and Harry, at a vigil around her coffin.

Camilla, wife of the new king and now Queen Consort, said the smile of the late queen was “unforgettable”, in her own tribute on Sunday.