Anyone still holding old £50 British banknotes is advised to exchange them for new ones before the end of April.
The old note features Sir John Houblon, the first governor of the Bank of England, and was first issued in 1994.
The banknote is being withdrawn from circulation by the Bank of England. The notes can be spent or deposited until the end of 30 April. Some banks and retailers can refuse to accept them after that.
However, Barclays, NatWest, RBS, Ulster Bank and the Post Office have all agreed to exchange Houblon £50 notes, up to the value of £200, until 30 October.
Any old notes that no longer have legal tender status can be exchanged at the Bank of England itself at any time.
The new notes, which arrived in 2011, feature Matthew Boulton and James Watt. The pair were recognised in part for their work in manufacturing coins that were difficult to counterfeit.
Approximately 224 million £50 notes are presently in circulation, of which an estimated 63 million are Houblon notes.
The Bank of England recently announced plans to introduce plastic banknotes into circulation. The £5 note featuring Sir Winston Churchill will be the first polymer banknote in 2016.
