There is currently around £80 billion of cash in circulation featuring Queen Elizabeth II's face in the UK.
Following Her Majesty's death, we can expect stamps, bank notes, coins and passports to change. Charles' image will soon feature on money, and there's another change we will soon see, too.
King Charles will face the opposite way to his late mother the Queen when his face replaces hers on coins and bank notes. This is due to a 17th-century tradition that the direction must alternate for each new monarch.