Businesses and consumers are being reminded that the old £10 notes are due to expire this week and will no longer be accepted.
Figures from the Bank of England suggest that there are still £2.2 billion of old paper £10 notes in circulation. But, from midnight on 1 March 2018, these old paper notes - featuring Charles Darwin - will no longer be legal tender.
Paper banknotes of £5, £10 and £20 are being gradually replaced by polymer ones, which are more secure and harder to counterfeit. These new banknotes also have raised bumps and dots, to help blind and partially-sighted users identify each banknote by touch.
They're also more resistant to dirt and wear, so last longer. According to the Bank of England, this means they're better for the environment, with a lower carbon footprint than the old paper notes.
From this Thursday 1 March, most shops and other businesses will only accept the new polymer £10 notes, featuring Jane Austen. However, people will still be able to exchange any old paper tenners for free at the Bank of England, either by post or in person. And some retailers, banks and building societies may choose to accept the old notes after this deadline - but they don't have to.
The old paper £5 note has already been replaced, and a new polymer £20 banknote will be issued in 2020. The Bank of England hasn't confirmed if the £50 note will be replaced.
All businesses that use cash are being urged to prepare for polymer banknotes; there's more information on the Bank of England website.