The Bank of England has printed 440 million polymer 5-pound notes it plans to introduce 13 September 2016. A new 10-pound polymer note featuring Jane Austen is scheduled to be introduced in mid-2017. A new 20-pound polymer note featuring J.M.W. Turner is expected in 2020. The bank has not yet decided if or when it will introduce a new 50-pound note, nor if it will be paper or polymer.
Courtesy of Antje Bird.