Prince William has released a statement honouring the Queen as both an "extraordinary leader" and a kind "Granny".

"She was by my side at my happiest moments. And she was by my side during the saddest days of my life," he says.

"I knew this day would come, but it will be some time before the reality of life without Granny will truly feel real."

LIVE UPDATES: Historic ceremonies take place in London and across UK

The newly crowned Prince of Wales, like his father and the rest of his family, is juggling mourning a beloved family member while taking on another level of public responsibility.

He thanked the Queen on behalf of his family and his entire generation.

"My grandmother famously said that grief was the price we pay for love. All of the sadness we will feel in the coming weeks will be testament to the love we felt for our extraordinary Queen," he says.

"I will honour her memory by supporting my father, the King, in every way I can."

Much has been made about the place in history of Queen Elizabeth II, Britain's longest serving monarch and, until her death on Tuesday, the world's.

READ MORE: What happens to the Queen's Birthday public holiday in Australia now?

https://twitter.com/KensingtonRoyal/status/1568623203404201984

William acknowledged how much was still to be written about his grandmother on the pages of history as the world grappled to understand the significance of the past 70 years.

"I, however, have lost a grandmother," he wrote.

"And while I will grieve her loss, I also feel incredibly grateful. I have had the benefit of The Queen's wisdom and reassurance into my fifth decade."

READ MORE: Here are the new titles the British royal family will now receive

For a family grieving in public, a brief emergence from privacy for prayer and an acknowledgement of shared mourning.

Among the flowers stacked at Balmoral Castle's gates, there was a sombre wave, a brief and respectful round of applause and what appeared to be tears as senior royals remembered their mother and grandmother.

Princess Anne, Prince Edward, Prince Andrew and princesses Eugenie and Beatrice were among those to emerge from Crathie Kirk church, just across the River Dee from Balmoral Castle on Saturday (late Saturday night AEST).

LIVE UPDATES: Historic ceremonies take place in London and across UK

READ MORE: What happens to the Queen's Birthday public holiday in Australia now?

They spent several minutes inspecting the large pile of flowers and notes left at the gates.

Eugenie, seen embracing Andrew, appeared to wipe away a tear as she looked at the tributes.

Pain was etched on the face of Sophie, Countess of Wessex, as she crouched by the blooms.

Then, when the time came for those gates to swing shut again, allowing the pile of flowers to grow further, a short round of applause.

The royals stopped and waved, Andrew made the sign of prayer and they turned as one to return to Queen Elizabeth II's favourite place in the world, where her body still lies.

Andrew was stripped of his royal patronages and settled a lawsuit filed by a woman who said she was sexually trafficked to the British royal by the financier Jeffrey Epstein when she was 17.

Crowds gathered outside of Buckingham Palace ahead of the proclamation of King Charles III.

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The death of the Queen and swearing in of a new King has naturally brought about the question of what will happen to the Queen's Birthday public holiday in Australia.

Experts do not expect the day will change, seeing as the public holiday did not previously occur on Queen Elizabeth II's actual birthday, April 21, in any Australian state.

"Already in Australia we have different dates where the Queen's birthday is celebrated," Sydney University's cultural historian Dr Cindy McCreery has said.

READ MORE: What we know about plans for the Queen's funeral

"And of course they've got nothing to do with the Queen's actual birthday anyway."

She expects the public holiday will remain on the same date in each state, but the name will change to the 'King's Birthday' public holiday.

New South Wales, Victoria, Tasmania, ACT, South Australia and the Northern Territory have traditionally marked the public holiday on the second Monday of June, while it has been taken in September in Queensland, and in October in Western Australia.

Monarchs' birthdays used to be celebrated publicly on their actual dates of birth until King George V, Elizabeth's grandfather, died in 1936.

He had been born on June 3, 1865.

Following his death, most Australian states continued to celebrate the monarch's birthday around that same date.

EXPLAINED: What happens next: Huge 24 hours for the King starts now

Things that are expected to change over time

However, many other things related to the Queen are set to change with her passing.

"It's enormous the number of things that will have to change but they're going to have to change slowly," Dr McCreery said.

Australia's $5, which bears the Queen's portrait, is not expected to change for many years.

But new coins will be minted in the next 12 to 18 months once a portrait of King Charles the third is approved for use.

He will face to the left not right, with a tradition dating back to King Charles II dictating the portraits change direction with the changing of a monarch.

Extensive changes will have to take place for the legal profession following the Queen's passing, with the late Queen intertwined in many procedures and formalities.

READ MORE: Order of succession after Charles becomes king

Senior barristers who were Queen's Counsel or QC, have already changed to King's Counsel – KC.

People are also prosecuted in the name of the monarch, with cases having been brought by the Queen against accused persons.

They will now have to be brought in the name of the King.

Victoria's parliament will also not be able to resume until each MP has sworn allegiance to King Charles III.

Victoria is the only state where the swearing will be required.

Operation Unicorn is the name given to a set of detailed plans outlining what should happen if Queen Elizabeth II died in Scotland.

That operation is now in motion, after the UK's longest-serving monarch died peacefully at Balmoral, her beloved Scottish estate.

Leaked some time ago, the operation's plans reveal the Queen's coffin will temporarily rest at the Palace of Holyroodhouse, the official residence of the British monarch in Scotland.

LIVE UPDATES: King Charles III delivers first speech since the death of Queen

READ MORE: What happens in the next fortnight?

Her coffin is currently in the ballroom of Balmoral Castle before it is moved in the coming days to the Palace of Holyroodhouse at Edinburgh.

Buckingham Palace has not confirmed what day the coffin will be moved from Balmoral to Edinburgh.

A ceremonial procession of the coffin will then continue along the Royal Mile in Edinburgh to St Giles' Cathedral.

There would be a service at the cathedral, attended by the royal family, before a 24-hour period of lying at rest.

It is believed the public will be able to view her coffin at St Giles' Cathedral however Buckingham Palace is yet to confirm this.

The coffin will then move to London, either by royal train or on a plane.

It will then be taken to Buckingham Palace before the big ceremonial procession in the capital planned for "D+5" of the 10-day funeral plans, which will involve the Queen lying in state.

In the afternoon on D+5 a gun carriage procession will take the coffin from Buckingham Palace to Westminster Hall at the Palace of Westminster.

It's expected members of the family and palace staff will walk on foot behind the procession, which will travel past the Queen Victoria Memorial and on to Pall Mall, through the Horse Guards Parade, Whitehall, Parliament Square and into New Palace Yard.

Huge queues are expected to occur when Queen Elizabeth's coffin lies in state at Westminster.

When the Queen Mother's coffin lay at Westminster Hall in 2002, thousands of people lined up to pay their respects.

Each year, the Queen would travel north to spend her summers at Balmoral in Aberdeenshire.

READ MORE: The life and achievements of Queen Elizabeth II

Balmoral, a 50,000-acre estate, is widely thought to be the monarch's favourite residence.

In 1852, Prince Albert purchased the estate as a gift for his wife, Queen Victoria.

Balmoral is a private residence, rather than a royal residence belonging to the crown estate.

READ MORE: How Australians can pay tribute to Queen Elizabeth

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A pedestrian has died after being hit by a tram on a busy street in South Melbourne.

The crash occurred in an inbound lane of Kings Way near the Citylink off ramp just after 1.30pm.

The person died at the scene and is yet to be identified.

READ MORE: What we know about plans for the Queen's funeral

The exact circumstances surrounding the collision are being investigated.

Motorists are being advised to expect significant delays in the area with three inbound lanes closed on Kings Way.

Anyone with information, dashcam or CCTV footage of the incident is urged to contact police.