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Queen Elizabeth II was the first British Monarch to appear on Bank of England banknotes.
The Series "C" (green) One Pound note (Chief Cashier L.K. O'Brien) was the first to be issued with her portrait on the 17th of March, 1960.
The collective noun for banknotes is a wad of banknotes.
C means "classic" in nokia c series
They have all appeared on Bank of England Series "E" banknotes.
Plastic banknotes are more durable and more waterproof than paper banknotes, as well as being harder to counterfeit.