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 coin or check their change for the 'holy grail' 20p .

Now, there's another detail to keep an eye out for in your one pound coin. According to a coin expert on Instagram, known as @CoinCollectingWizard, there's a unique 'error' on the obverse that could potentially be lurking in your spare change. The man, who has garnered over 32,200 followers, regularly points out the types of designs worth keeping an eye out for, and his latest post is no different.

He recently encouraged followers to "check your change carefully", singling out the 'fried egg' error coin as particularly valuable to keen

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