A guard has fainted off the podium while holding vigil next to the Queen's Coffin as she lies in state inside the Palace of Westminster.

Hundreds of thousands of mourners have been queuing to pay their final respects to the monarch following her death at Balmoral on Thursday.

But onlookers were aghast when a guard began swaying on his feet moments before he collapsed.

The man had moments earlier briefly stepped off the podium before retaking his place as other servicemen joined him for a changeover.

But seconds later he blacked out and fell forwards, landing sprawled on the stone floor to loud gasps from bystanders queueing to pay their respects.

The live stream also cut out for several minutes as police rushed to the man’s aid.

The Queen's coffin, which has been placed on a raised platform called a catafalque, is being guarded around the clock by units from the Sovereign's Bodyguard, the Household Division, or Yeoman Warders of the Tower of London.

It comes after crowds lined the streets of central London as she was moved from Buckingham Palace to Westminster Hall on Wednesday afternoon.

King Charles, William and Harry reunited to mourn and march behind the coffin it made its final journey out of Buckingham Palace at 2.22pm.

A short service was held involving the Royal Family at the Palace of Westminster, before members of the public were given access to pay their respects from 5pm.

As the late monarch's coffin was placed in the hall, photos captured a poignant moment for the Duke of Sussex as he held his head in his hand, shielding his eyes, and looked down.

Wearing a suit decorated with medals, he is standing next to the Duchess of Sussex, who is looking down with a sombre expression on her face.

Prince Harry and his brother Prince William stood together with their wives Meghan and Kate as they put aside their bitter feud to pay their respects to their grandmother.

While the siblings walked side-by-side for the poignant 38-minute procession from Buckingham Palace, their spouses travelled in separate cars, with Meghan accompanied by the Countess of Wessex and Kate joined by Camilla, the Queen Consort.

During the service, the 'Fab Four' stood in formation facing the coffin on its purple-covered catafalque, which was flanked with a tall, yellow flickering candle at each corner of the wide scarlet platform in the heart of Westminster Hall - the backdrop of some of the most famous moments in British history. (Credit: Daily Mail UK, excluding headline)

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