Less than 100 days left to spend billions of pounds of old-style paper £20 and £50 notes

Old notes featuring Adam Smith, James Watt and Matthew Boulton will soon become useless

Old paper £20 notes must be spent or deposited by 30 September (Reuters)

Consumers have just 100 days to spend £16bn worth of old-style paper banknotes before they are no longer legal tender.

Millions of £20 and £50 notes printed on paper remain in circulation but from 1 October only the newer polymer versions can be used.

Anyone who has the old currency must spend it by 30 September, the Bank of England said, or deposit the notes at a bank or Post Office.