Check pockets and purses for paper £20 and £50 notes as there are millions of them still around – and you'll soon no longer be able to use them

If you miss the deadline, or have other withdrawn Bank of England notes or old UK £1 coins floating about – here's how to make them spendable again

The same FOI data revealed there were 113 million Bank of England-issued £5 notes (worth £566 million) and 73 million paper £10 notes (worth £726 million) still in circulation, despite these being withdrawn in 2017 and 2018 respectively.

According to new figures from the Royal Mint, there are also £105 million old round £1 coins still in circulation. These lost their so-called "legal tender" status in October 2017.

If you're unsure what you're looking for, check out pictures of the old 'round pound' on the Royal Mint website and view images of the old paper £5 and £10 notes on the Bank of England website. If you find any, here's what to do with them:

• Your bank may swap or deposit old paper notes and coins. Banks don't legally have to accept old paper notes and coins once they've been withdrawn from circulation. However, some may continue to allow you to swap them, while others may let you deposit old notes and coins into your account.
  
  Of the other major banks that came back to us, Barclays, Halifax, Lloyds, Nationwide, NatWest and Santander all said you can deposit old coins and notes into your account. We also asked PayPoint, which allows Monzo customers to deposit cash into their account. These customers will have to go to the Bank of England to swap old notes should they have them after the deadline.

• The Post Office will deposit old paper notes and coins into your bank account, which you can then withdraw. To do this, your bank will need to be signed up to receive cash deposits via the Post Office. You can check this on the Post Office website, although many major providers are signed up. You can't, however, do a direct cash swap at a post office.

• For notes only: If your bank or post office can't help, you can swap paper notes for polymer versions at the Bank of England. You can do this in person at the Bank of England counter at Threadneedle Street, London. You may need to provide two original identity (ID) documents (one photo ID and one proof of address) for any exchange – this is also mandatory for any exchange of £700 or more. To check what ID the Bank of England accepts, see the 'Identification we accept' page on its website.
  
  You can also do this by post, which may be the only option for those who don't live or work in London – though if you do this, consider paying extra for a delivery service that provides compensation if your post goes missing. You can find out more on the Bank of England website. Neither the Bank of England or the Royal Mint will accept old coins.

• Alternatively, ask a friend to help. If your bank or post office won't accept your old notes and coins, and you can't get to the Bank or England or you're worried about sending cash in the post – see if a friend or family member can ask their bank or post office instead. They can then transfer or hand over the money to you.