Legal Tender

The Bank of England first issued the paper £20 note in 2007. It features the economist Adam Smith. On 20 February 2020, the bank issued a new polymer £20 note with the intention of phasing out the paper notes. 30 September 2022 is the last day you can use the paper £20 and £50 notes.

This is the page on the Bank Of England web site with the information.