If you still have an old £10 note in your wallet, it's time to spend it.
A use by date of March 1 has been slapped on the paper notes following the introduction of the plastic tenner on September 14.
Around 55 per cent of the £10 notes now in circulation are the newer version pictured above, while the remaining 359 million are made of paper.
Old notes can still be spent ahead of this date and you can exchange them at the Bank once this point has passed.
Like the £5 note already in circulation featuring Sir Winston Churchill, the new £10 banknote is made from polymer, which is more durable and expected to last five years in total.
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Bank of England governor Mark Carney said about the notes: "The new £10 will be printed on polymer, making it safer, stronger and cleaner".
The note, which is slightly smaller than its paper predecessor, includes a series of raised dots in the top left-hand corner to help visually-impaired users to identify the denomination of the note.
But the new notes have not been introduced without problems after vegans, Hindus and Sikhs complained they contain tallow, a substance derived from animal fat.
The Bank of England says they are also an improvement on the previous version in terms of security and durability.
The new bank notes follows suit of the old style £5 which went out of circulation in May, and the old £1 coin which is no longer legal tender.