The Wall Street Journal reports that the wheels have been set in motion in the United Kingdom for a vast effort to (eventually) replace the 29 billion coins and 4.7 billion bank notes in circulation that are carrying the likeness of Her Majesty Queen Elizabeth II.
The same will be true for stamps. The current definitive series first class mail stamps for the Royal Mail in the United Kingdom all feature the queen.
The Royal Mail has been around forever— well, almost. It was founded 506 years ago in 1516.
Stamps are a more recent invention: the first ones were printed in 1840.