This Bank of England £20 note. Sarah John signature. The note has a prefix CM44  701447 which makes it a unique and valuable addition to any collection. The note is  circulated and comes in  original state, making it a great investment for collectors and enthusiasts alike. The denomination of the note is £20, and it is a perfect representation of the Elizabeth II era. The note is a must-have for anyone who loves British currency, and it is a great way to celebrate the legacy of Sarah John.