The Bank of England has issued a warning to anyone who could have paper £20 or £50 notes. Both are set to stop being legal tender in just six months' time.
From September 30 the status of both will be withdrawn. So the Bank is now encouraging anyone who has one to spend it or deposit it at their bank or Post Office.
There are around £7 billion worth of paper £20 banknotes and £10.5 billion worth of paper £50 notes still in circulation. They are being replaced with the new polymer versions as they are returned.