The term "pound" to describe a sum of money, has been in use for about 1,000 years by the English.
It evolved from the unit of measure of weight, the Pound. This was because 240 silver Pennies weighed one pound back in the old days, and the term was used more for accounting purposes than as a unit of currency.
During the reign of Queen Elizabeth I around the late 16th century, a gold coin called the Pound (of 20 Shillings) was first minted, but did not last very long in the currency.
The Pound, in various denominations, was issued as paper money after the establishment of the Bank of England in 1694.
The first Bank of England Twenty Pound note was issued in 1725. The first Bank of England decimal Twenty Pound note was issued in 1970.
The Series "B" Bank of England (blue) Five Pound note was demonetised in 1967. The Series "C" Bank of England (blue) Five Pound note was demonetised in 1973. The Series "D" Bank of England (blue) Five Pound note was demonetised in 1991.
The Bank of England first issued a regular Fifty Pound note in around 1725. The Bank of England issued the modern Fifty Pound note in 1981.
The current Bank of England Ten Pound note with Charles Darwin on the reverse weighs 0.923 grams.
The Bank of England One Pound note was demonetised in 1988.
The fifty pound Sterling note is the largest bank note in circulation in England.
The Bank of England produced a Forty Pound note from 1725 to 1851.
The building on the reverse of the Series "A" One Pound note, is the Bank of England building as it appeared in 1928.
See the Bank of England link below.
A new Bank of England Fifty Pound note featuring Matthew Boulton and James Watt was issued into circulation on the 2nd of November, 2011. The older style Bank of England Fifty Pound note featuring Sir John Houblon will be progressively withdrawn from circulation at a date to be advised after a public announcement from the Bank of England.
The Bank of England Five Pound note issued from 1971 until 1990, features the Duke of Wellington and the Battle of Waterloo.
There is no British Fifteen Pound note currently, but in 1759, the Bank of England did issue a Fifteen Pound note. The note was last issued in 1822. It was white and printed on only one side.