God Save The King sang at end of memorial service for Queen at St Paul's Cathedral

The first official rendition of God Save The King of the new monarch's reign has been sung at the end of a memorial service for the Queen.

The lyrics to the national anthem have changed from "Queen" to "King" and "her victorious" to "him victorious" to mark King Charles III becoming head of state.

It comes after crowds spontaneously sang the version of the song outside Buckingham Palace on Friday as the King arrived with the Queen Consort Camilla.

King Charles gives emotional address - follow live updates

The anthem is also expected to be sung at the Kia Oval cricket ground on Saturday as England and South Africa's Third Test Match resumes. The match was paused on Friday following the Queen's death.

No members of the Royal Family were present at the service at St Paul's Cathedral but audio of King Charles's first address to the nation was played to the congregation.

The King said he was speaking with "feelings of profound sorrow" as he told the country: "Queen Elizabeth's was a life well lived; a promise with destiny kept and she is mourned most deeply in her passing. That promise of lifelong service I renew to you all today."

King Charles went on to say: "As the Queen herself did with such unswerving devotion, I too now solemnly pledge myself, throughout the remaining time God grants me, to uphold the constitutional principles at the heart of our nation.

"And wherever you may live in the United Kingdom, or in the realms and territories across the world, and whatever may be your background or beliefs, I shall endeavour to serve you with loyalty, respect and love, as I have throughout my life."

Prime Minister Liz Truss and senior ministers were also in attendance along with 2,000 members of the public who collected wristbands on a first-come-first-serve basis.

Ms Truss, who met King Charles for a brief audience in-person at Buckingham Palace earlier, gave a brief reading from the Bible.

She said: "We do not live to ourselves, and we do not die to ourselves. If we live, we live to the Lord, and if we die, we die to the Lord; so then, whether we live or whether we die, we are the Lord's."

Members of the congregation became tearful through the service as the choir sang.

One woman was seen using a handkerchief to wipe her eyes as she sat in the pews at St Paul's.

The Bishop of London then gave an address where she said the Queen had a "remarkable Christian faith" and Jesus Christ was a "fountain and well from which she drew deeply".

Dame Sarah Mullally continued: "If Christ was her anchor, her husband, the late Prince Philip was, in her own words, Her Majesty's 'strength and stay'.

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"Yet even in the depths of her own mourning we saw once again her courage and her instinct for putting the needs of others first."

Dame Sarah also reflected on the longevity of the Queen's reign, describing her as a "remarkable constant in the lives of millions".

Deputy Prime Minister Therese Coffey, Leader of the Commons Penny Mordaunt and Welsh Secretary Robert Buckland were seen all standing together and singing along to a hymn during the service.

The Archbishop of Canterbury Justin Welby delivered the blessing at the end of the hour-long service.

Solemn Prelude "In Memoriam" from For The Fallen by composer Edward Elgar was played before the service got under way at 6pm.

The hymns All My Hope On God Is Founded and O Thou Who Camest From Above were sung during the event.

A hundreds-strong queue formed ahead of the service, winding from St Paul's to beyond the Tube station streets away.

Many people were dressed smartly in black suits and ties while others wore black mourning veils as they waited to take their seat inside the cathedral.