Here is a list of all the things that will change:
Currently, there are 4.5 billion sterling banknotes in circulation with a combined value of £80 billion, with Queen Elizabeth II's face on them. Following the monarch's death, the banknotes and coins will be replaced with alternatives, featuring the head of the new monarch, King Charles III, in this case. However, the replacement will likely take two years before the old currency is phased out. Back in 1952, when the Queen ascended the throne, the bank notes did not feature the monarch's head. It changed in 1960 when Queen Elizabeth II's face was featured on £1 notes for the first time. The image of the new monarch will be featured after it is agreed with Buckingham Palace.