The new 12-sided one pound coins (Picture: Victoria Jones/PA Wire) You have not got long left to spend those old £1 coins you have sitting in your piggy bank or lingering down the back of the ...

The new coin was introduced on March 28 because one-in-30 old pound coins currently in circulation are fake, according to the Royal Mint. The 12-sided version is designed to be harder to counterfeit.

We have until midnight tomorrow (Sunday, October 15, 2017) to spend our old pound coins. The ‘round pound’ stops being legal tender from then, having been replaced by a 12-sided counterproof ...

The old round pound coins are no longer legal tender and shops, restaurants and other retailers stopped accepting them in 2017. Some stores accepted them for a limited time after that date.

Royal Mint's annual 2017 set, which will feature four brand new designs, (from top) the First World War Aviation £2 coin, Sir Isaac Newton 50p,the Jane Austen £2 coin, and the twelve sided £1.

The new one pound coin introduced in 2017 (Image: Royal Mint) The new £1 coin was introduced to help stop counterfeiters, as the old £1 coin was so vulnerable to sophisticated counterfeiters ...

By Lauren O'Callaghan 19:03, Mon, Oct 9, 2017 | UPDATED: 19:47, Mon, Oct 9, 2017 Bookmark Getty Images Tesco will defy Royal Mint and continue to accept old pound coins past the circulation deadline ...

Over the past six months, more than 1.2 billion round pound coins have been returned but some £500 million worth of the old coins are still in circulation. They were replaced by the new 12-sided ...

This old one pound coin design is the most valuable, according to ChangeChecker. The site predicts that there are between 600,000 to 800,000 of them in circulation, according to the Coventry ...

Anyway, despite the fact that we'll have until October 15th of this year to spend all our old pound coins, isn't this as good a time as any to comb through all the quids you might have lying ...

The deadline for spending the old £1 coin is just a week away (though everyone still seems a little confused about this), so it’s time to get rid of those round pounds.

About 1.2 billion of the old coins have so far been returned, but an estimated 500 million are still in circulation.