It's time to crack open your piggy bank and look down the back of your sofa - because you could be hoarding some rare £1 coins.
The old circular £1 coin became void in October 2017. And that means these traditional coins are in high demand among collectors.
Some are being sold for more than 30 times their value.
Coin collecting site Change Checker has a 'Scarcity Index' identifying the rarest coins currently in circulation.
The Scarcity Index ranks each of the 'rare' coin designs from one to 100, with 100 being both the most scarce and valuable.
For most coins this index is regularly updated. But for the circular £1 coin it is set in stone, because the coin is now out of circulation.
So your coins may be worth a lot more than you originally thought.
To find out whether your £1 coins are worth more than you thought you can compare them to the 12 most sought-after below:
1. Edinburgh City (2011, Scotland). The rarest £1 coin in circulation, selling for up to £34. With a circulation of between 600,000 and 800,000, you'd have to examine 3,000 £1 coins to have a chance of finding one.
2. Cardiff City (2011, Wales). Ranked second rarest, like the Edinburgh coin, Cardiff £1 coins in perfect condition can sell for up to £30, but most sell for around £5.
3. London City (2010, England). Ranked third rarest. Like the Edinburgh and Cardiff coins, London £1 coins in perfect condition can sell for up to £30, but most sell for around £5.
4. Thistle & Bluebell (2014, Scotland). These coins in excellent condition are selling for up to £10 on eBay.
5. Crowned Shield (1988, UK). These coins in excellent condition are selling for around £6 on eBay.
6. Rose & Oak (2013, UK). Being sold for up £15, but most will be sold for £3.
7. Flax & Shamrock (2014, Northern Ireland). Coins can fetch up to £34 on eBay- more than 30 times their face value.
8. Daffodil & Leek (2013, Wales). Coins in excellent condition are selling for up to £15 on eBay.
9. Belfast City (2013, Northern Ireland). Coins are selling for up to £30 on eBay.
10. Lion Rampant (1994, Scotland). Coins are averaging at £2-£3 on eBay.
11. Millennium Bridge (2007, England). Coins are selling at an average of £3.
12. Flax (1986, 1991, Northern Ireland). Coins are selling on eBay for up to £17- well over 10 times their face value.
You can check the value of your coins on the ebay.com auction website or any other selling platforms.
To find out how much £1 coins have previously sold for tick the 'sold' box on the left hand side on eBay, and rank your findings by 'value'.
