The polymer £20 note, which was first issued on 20 February 2020, has various security features to help operators confirm the cash is genuine.
This included a hologram image that alters if it is tiled from side to side (the words should change between ‘twenty’ and ‘pounds’).
Other security features include a portrait of the Queen printed on the window with £20 Bank of England’ printed twice around the edge.
It also shows a round purple foil patch containing the letter ‘T’ on the back of the note, directly behind the silver crown on the front.
Paper £50 notes started to be withdrawn on 23 June 2021 when the polymer version entered circulation, which also has a myriad of features that can help confirm authenticity.
One of these features is a metallic hologram that changes between the words ‘fifty’ and ‘pounds’ when the note is tilted.
Another is a largely transparent window with a gold and green foil on the front, showing a details metallic microchip image.
Furthermore, a security point to note on the £50 note is that, under a good quality ultraviolet light, the number 50 appears in bright red and green on the front of the note, against a duller background as well as a portrait of the Queen printed on the window with ‘£50 Bank of England’ printed around the edge.
All polymer notes have two key security features – a hologram that changes image and see-through windows.
The polymer £5 note was the first to change from paper, which was issued on 12 September 2016 and features Sir Winston Churchill. The £10 note followed this in September 2017 and features Jane Austen.
The latest edition of the £50 note means all Bank of England banknotes are now available on polymer.