The error appeared on the 20p coin due to an incorrect pairing of the old and new coin designs during the Royal Mint minting ...

You could be unknowingly harbouring a small fortune in your pocket, as certain rare coins can command a price far beyond their face value. In recent times, people have been urged to look for a 50p ...

As with just about any asset, a coin’s value is determined by its market demand. This means that coins in short supply often see higher demand — and higher values. With coins, supplies are limited ...