Rare coins are worth a lot of money, and anyone could have a tiny fortune hidden away in their change right now.
Do you know what to look out for to make the most of your money.
Some of these coins can fetch hundreds, even as much as £800, so a little time taken to inspect change could be worthwhile.
Do you know the most valuable coins and how much they are worth?
Most valuable £1 coin
New £1 coins with errors and trial coins
Some new £1 have been minted with minor errors, and these are going for a lot of money online.
The Sun reported flawed new £1 coins selling for as much as £300 online.
Check the coin to see whether the colours of the gold and silver have bled or whether the crown or any other part of the Queen has been stamped outside of the silver area.
Similarly, trial £1 coins, fakes which were released to shops before the currency change, can go for hundreds.
They are not legal tender, but the ‘uncirculated’ coins have sold online for £200.
Royal Arms £1
This coin design as actually very common – but one that was minted in 2008 can go for around £6, as its the fourth rarest.
Most valuable £2
Commonwealth £2
This coin was created for the Irish 2002 games. It is one of the rarest £2 coins and can sell for up to £25.
Most valuable 50p
Olympic Swimmer 50p
This is one of the most expensive rare coins you can find as a tiny amount were minted.
Only 600 were released into currency, meaning they are highly sought after and can go for £800.
Most valuable 20p
The undated 20p
A 20p without a fate could fetch you quite a sum of money.
Around 250,000 were minted in 2008 and can fetch £100 on the internet.
Changechecker.org has launched its 50p “Scarcity Index”, revealed which 50p coins are the most scarce and collectible.
At the top of the list is the Kew Gardens 50p with a score of 100.