From British money to the national anthem, here's everything the Queen's death will change in the UK

The British line of succession determines the order in which members of the royal family are in line to inherit the throne. 

Now that King Charles has succeeded the throne, everyone in the line of succession has automatically moved up a place. The royals most affected by this shift are the new monarch and Prince William, who is first in line to the throne.

"Philip called it a firm — but it's not a business," royal historian Marlene Koenig previously told Insider. "The only people who really matter in a monarchy are the sovereign and the heir to the throne. There's no constitutional role for anyone else within the royal family."

The UK began a 10-day period of national mourning on Friday, King Charles announced.

As Insider's Jacob Zinkula and Jyoti Mann reported, the stock markets, stores, and banks will close at certain times during this period, with the funeral on September 19 becoming a formal national holiday.

British coins and banknotes, which have the Queen's portrait on them, will be replaced with a portrait of the new monarch, King Charles. However, the process of replacing the portrait could take a number of years due to the large number of banknotes currently in circulation, according to The Coin Expert. 

While the Queen succeeded her father King George VI in 1952, she didn't appear on a Bank of England note until 1960, according to the Bank of England.

For 70 years, Britain's national anthem was "God Save the Queen." 

Now that the Queen is succeeded by her son, Charles, the lyrics will revert to the male version of the son, "God Save the King," which was used before she ascended to the throne.

In a statement to the public on the eve of her Platinum Jubilee in February 2022, Queen Elizabeth expressed her wish for Camilla to be given the title of queen consort when Charles takes the throne. 

"When, in the fullness of time, my son Charles becomes King, I know you will give him and his wife Camilla the same support you have given me; and it is my sincere wish that, when the time comes, Camilla will be known as Queen Consort as she continues her own loyal service," Her Majesty wrote.

The queen title can be given to a consort (spouse of the monarch) or to the monarch. 

King George V was the first British monarch to address the public with his Christmas Day speech in 1932, according to the royal family website. The purpose of the annual speech is to reflect on the past year and the meaning of Christmas.

The broadcast was a tradition upheld by Queen Elizabeth II and became an "intrinsic part of Christmas Day festivities for many people across the Commonwealth," the website adds.

Of course, it will be for the new monarch to decide whether to continue this tradition after the Queen's death. 

Charles' official duties as king will involve hosting a weekly audience with the prime minister, signing bills, and giving a speech at the State Opening of Parliament, which marks the formal start of the parliamentary year.

Charles and Camilla accompanied the Queen to Parliament in recent years. 

Every June the Trooping the Colour parade takes place at Buckingham Palace in celebration of the monarch's birthday. The parade is comprised of 1,400 parading soldiers, 200 horses, and 400 musicians, according to the royal family website.

The UK public and people across the world usually flock to London to witness the parade for themselves.

Sovereigns whose real birthdays fall in colder months celebrate a second birthday in the summer with the hope of good weather for their birthday parade, Insider's Chloe Pantazi previously reported.

Since Prince Charles' birthday is on November 14, he could choose to celebrate Trooping the Colour in June as his mother did before him. 

It has been widely reported for several years that Charles plans to reduce the monarchy to a team of just eight key members, all senior working royals. 

Although it's not yet known whether the reports are true, slimming down the monarchy would have a positive financial impact on British taxpayers. 

Reducing the number of royals who undertake official duties would also mean reducing who is funded by the sovereign grant, the public funds used to support them, The Times previously reported.