Is the penny overdue for withdrawal? Isn't it about time we got a circulating £5 coin? This graph attempts to answer that kind of question by showing the real value of the various banknotes and coins circulating in England and Wales since 1900.
Thick lines are banknotes, thin lines are coins, and the vertical scale is their value in 2016 pounds sterling. Inflation figures come from the ONS time series “Long term indicator of prices of consumer goods and services (Jan 1974=100)” (CDKO). Dates of introduction and withdrawal of currency units are from Wikipedia. Notes issued other than by the Treasury and the Bank of England are omitted, as is the period before 1900 because long-term inflation was basically zero then.
The code to generate the graph is held in Bazaar. You can get your own copy by running
bzr branch http://bjh21.me.uk/denom/
Contains public sector information licensed under the Open Government Licence v3.0.