The value of one pound from 1750 to 2011. Essentially, one decimal penny from 1750 (eg the equivalent of £0.01) was worth the equivalent of about £1.80 in today’s money. From this wonderful House of Commons library paper. Below is the same chart in logarithmic scale.
And below is how retail prices have evolved over the same period. See if you can spot the beginning of the fiat currency era.