As such, the new £20 note measures 139 by 73 millimetres - reduced from the "F" series £20 Adam Smith notes of 149 by 80 millimetres. Unlike the £5 and £10 denominations, and as part of the new polymer design, the £20 note incorporates two windows as well as a two-colour foil, making it very hard to replicate.
A new £20 note made of polymer rather than traditional paper has been hailed as the most secure banknote yet as it entered circulation today.
You can still use the old £20 notes for the next six months, ahead of its legal tender status being withdrawn. It has two clear windows, a hologram which changes between the words Twenty and Pounds when tilted, and a silver foil patch with 3D crown as well as raised polymer print.
Turner's signature from his will, in which he bequeathed many of his paintings to the nation. It is also larger than both the £10 and £5 notes.
The new £20 denomination will also be the first banknote to include, from its initial issue, the signature of Sarah John, the current Bank of England cashier.More news: Storm Dennis: Aerial Views Show Extent of Severe Flooding in Central England
Under a good quality ultra-violet light, the number "20" appears in bright red and green on the front of the note, against a duller background.
A new polymer £50 featuring Bletchley Park codebreaker Alan Turing will be issued next year.
Could you get your hands on one of the rare serial numbers for the new £20 note?
- What about the old £20 note?
Turner's self-portrait, as featured on the new £20 note, is on display at Tate Britain alongside the banknote. "Turner is one of the most influential British artists and we're now bringing his art to the pockets of people all over the UK".More news: Bong Joon-ho Parasite storyboards are transforming into a graphic novel
Paper money is being replaced by polymer notes. We hope the creation of these notes will help enable people with sight loss to use money more easily and with confidence.
And about another 26 million £10 notes were replaced in the two years since they were launched in September 2017.
Bank of England governor Mark Carney brandish the polymer note at a symbolic launch party at Tate Britain, home to some of Turner's most well-known paintings.More news: Now, Trump attacks Oscars for `Parasite` best picture win