The new banknotes are cleaner, stronger and last longer than the old paper notes.
Private report by UK firm criticizes polymer bank notes
Plastic five pound note goes into circulation today - but how sturdy is it really?
No change for the new five pound note - Marketing Stockport
Bank of England's new £5 polymer bank note is shrinking, but not how you think
Britain's New Plastic Money Can Survive a Washing Machine - The Atlantic
U.K.'s New £10 Note Gets a Fresh Face: Jane Austen - The New York Times
Winston Churchill plastic £5 note ends trail of paper money, Currencies
Six-month warning over £20 and £50 paper notes
A Complete Guide to British Currency
King Charles III portrait to appear on Bank of England money - The Washington Post