The Post Office is preparing for a “last moment” rush in customers depositing paper £20 and £50 banknotes in its branches across the Bradford district this week, before they can no longer be used in shops or to pay businesses.

September 30 is the last day that the Bank of England’s paper £20 and £50 banknotes will have legal tender status.

To date, £1.2 billion worth of paper £20 and £50 banknotes have been deposited at Post Office’s 11,500 branches.

The total has been made up of £372 million-worth of paper £20 banknotes and £820 million-worth of £50 banknotes.

So far this month, over £100 million-worth of the notes have been deposited at Post Office branches.

After September 30, only polymer Bank of England banknotes will have legal tender status.

The new polymer £20 notes feature artist JMW Turner, and the new polymer £50 notes feature Bletchley Park codebreaker Alan Turing.

Postmasters have their branches set up to handle large volumes of cash, with over £3 billion in cash deposited and withdrawn at Post Offices every month.

Martin Kearsley, Post Office banking director, said: “Postmasters and their staff are on hand to provide that human reassurance that your old notes have been deposited into your bank account and will provide a receipt too. Most Post Offices are open long hours including on Friday.”