People who have £20 or £50 paper notes with the late Queen's face on them have just six days left to spend them.
The Bank of England has said that from Friday (September 30), these notes will be made redundant in order to tackle counterfeits. Despite the change looming, the BoE has urged the public not to change their money in a hurry.
The bank sent out a warning that long queues are already starting to form and people are expected to wait hours in some places. The public are able to swap their notes at any of their branches including the Post Office and other high street banks.
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As previously reported, the paper notes will then be swapped out for new, polymer versions. A Bank of England statement said: "The Bank of England Counter is currently open from 9.30am to 3pm Monday to Friday and is experiencing very high demand. There will be long queues and you may encounter waiting times in excess of an hour.
"We would ask that you kindly consider the long wait times when travelling to the Bank to undertake an in person exchange - if you arrive after 2pm it is possible you may not get served before we close.
"Unless you require your banknotes immediately, we would suggest sending your banknotes via the post."
If you go to a Post Office from September 15, you can swap banknotes - but only at certain branches. You can also only swap up to £300 in old banknotes.
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