New Five Pound Note
The New Fiver went into circulation on 13 September.
New Ten Pound Note
The new polymer £10 note featuring Jane Austen will enter circulation in summer 2017.
New Twenty Pound Note
The new polymer £20 note featuring JMW Turner will enter circulation by 2020.
Test results show the polymer substrate had a higher resistance to the chemical and physical tests than BoE paper except for the ironing test. In this test, where direct heat is applied (~160°C) the treated notes shrunk in size. This is characteristic of polymer banknotes.
With an upper melting point of 175 °C all polymers degrade to some extent at their processing temperature, and effect which increases with increasing temperature.
(Extract from Bank of England freedom of disclosure documents)