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The pound sterling is the official currency of Great Britain and Northern Ireland. It is often simply called the pound, with "pound sterling" used mainly in formal contexts or when it is necessary to distinguish the unit of currency from others that have the same name (the term British pound is also often used for this purpose). The term quid in British slang is possibly derived from the Royal mint at Quidhampton, Wiltshire, England. The currency in general is sometimes called just sterling (e.g. "payment must be in sterling").

The pound was originally the value of one pound (weight) of sterling silver (hence "pound sterling"). The sign for the pound is the pound sign, £ (or rarely just "L"). The symbol, £, for the pound is derived from the first letter of the Latin word for pound, the librum..

One pound is divided into 100 pence, the singular of which is "penny". The symbol for the penny is "p"; hence an amount such as 50p (£0.50) is usually pronounced "fifty pee" rather than "fifty pence."

Prior to decimalisation in 1971, each pound was divided into 240 pence — although it was usually expressed as being divided into twenty shillings, with each shilling equal to twelve pence. The symbol for the shilling was "s" — not from the first letter of the word, but rather from the Latin word solidus. The symbol for the penny was "d", from the French word denier (sum of money), which in turn was from the Latin word denarius. (The solidus and denarius were Roman coins.) A mixed sum of shillings and pence such as "two shillings and six pence" would be written as "2/6" and spoken as "two and six". Five shillings would be written as "5s" or, more commonly, "5/–".

The multiples involved in the pre-decimal currency were such that amounts such as a pound or a shilling had many factors into which they could be exactly divided. However, as these monetary amounts decreased in spending power, and their subdivision therefore became a less important issue, it was decided instead to introduce decimal currency in order to simplify arithmetic.

After Decimal Day (21 February 1971), the value of one penny was therefore different from its pre-decimalisation value. For the first few years after 1971, the new type of penny was commonly referred to as a "new penny". Coins for denominations of ½p, 1p, 2p, 5p, 10p and 50p all bore the name New Pence (or New Penny) until 1982, when the inscription changed to Half Penny, One Penny, Two Pence, Five Pence and so on. The old one shilling ("1/–") and two shillings ("2/–", florin) coins were equivalent in value to 5p and 10p respectively, and as such these coins remained valid within the decimal system until the 5p and 10p coins were each later replaced with smaller versions in the early 1990s.

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Sterling

Sterling (with a basic currency unit of the Tealby penny, rather than the pound) was introduced as the English currency by King Henry II in 1158, though the name sterling wasn't acquired until later. The word sterling is from the Old French esterlin transformed in stiere in Old English (strong, firm, immovable).

The sterling was originally a name for a silver penny of 1/240 pound. Originally a silver penny had the purchasing power of slightly less than a modern pound. In modern times the pound has replaced the penny as the basic unit of currency as inflation has steadily eroded the value of the currency.

The pound sterling, established in 1560–61 by Elizabeth I and her advisors, foremost among them Sir Thomas Gresham, brought order to the financial chaos of Tudor England that had been occasioned by the "Great Debasement" of the coinage, which brought on a debilitating inflation during the years 1543–51. By 1551, the silver content of a penny had dropped to one part in three. The coinage had become mere fiduciary currency (as modern coins are), and the exchange rate in Antwerp where English cloth was marketed to Europe, had deteriorated. All the coin in circulation was called in for reminting at the higher standard, and paid for at discounted rates.

The pound sterling maintained its intrinsic value — "a fetish in public opinion" Braudel called it — uniquely among European currencies, even after the United Kingdom officially adopted the gold standard, until after World War I, weathering financial crises in 1621, in 1694–96, when John Locke pamphleteered for the pound sterling as "an invariable fundamental unit" and again in 1774 and 1797. Not even the violent disorders of the Civil War devalued the pound sterling in European money markets. Braudel attributes to the fixed currency, which was never devalued over the centuries, England's easy credit, security of contracts and rise to financial superiority during the 18th century. The pound sterling has been the money of account of the Bank of England from its inception in 1694.

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Bank of (Northern) Ireland notes

All Bank of Ireland notes feature the Queen's University of Belfast on the obverse. The principal difference between the denominations is their colour and size.

  • 5 pound note, blue
  • 10 pound note, pink
  • 20 pound note, green
  • 50 pound note, blue-green

First Trust Bank notes

First Trust Bank is the successor to the Allied Irish Banks (AIB). It was formed by a merger of the Northern Irish parts of AIB and TSB. AIB was itself the successor to the Provincial Bank of Ireland following another merger. The banknotes issued by First Trust Bank continue the series started by the Provincial Bank of Ireland, also issued by AIB.

First Trust Bank's current notes depict generic people of Northern Ireland on the front, alternately male and female, but with a pair of older people on the £100 note. The obverse generally features designs associated with the Spanish Armada, or coastal features.

A £100 First Trust Bank note. A £100 First Trust Bank note
  • 10 pound note featuring the vessel Girona (galleass) on the obverse
  • 20 pound note featuring the chimney at Lagada Point on the obverse
  • 50 pound note featuring a commemorative medal on the obverse
  • 100 pound note featuring the Armada on the obverse
A £5 note featuring Dunluce Castle on the obverse was issued by the Provincial Bank of Ireland and by AIB, but has not been issued by First Trust Bank.

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Northern Bank notes

  • 5 pound note featuring the U.S. space shuttle
  • 10 pound note featuring J. B. Dunlop on the front and the portico of Belfast's city hall on the back
  • 20 pound note featuring Harry Ferguson on the front and the portico of Belfast City Hall on the back
  • 50 pound note featuring Sir S.C. Davidson on the front and the portico of Belfast City Hall on the back
  • 100 pound note featuring Sir James Martin on the front and the portico of Belfast City Hall on the back
A £20 Northern Bank note (this version was withdrawn in 2005).
A £20 Northern Bank note (this version was withdrawn in 2005).
£5 Northern Bank note (front)
£5 Northern Bank note (front)

Following the theft of £22 million from its money handling centre in Belfast on 22 December 2004, allegedly by the Provisional IRA, Northern Bank announced on 7 January 2005 that all its notes were to be recalled and reissued in different colours and styles, and using the bank's new logo. The reissue began on 14 March 2005 and was scheduled to take one month; old notes remain exchangeable at branches of Northern Bank.

The principal colours of Northern Bank notes of greater than £5 face value were changed with the 2005 reissue, and are now (former colour in brackets):

  • £10 green (brown)
  • £20 blue (purple)
  • £50 purple (green)
  • £100 red (black)

Ulster Bank notes

Ulster Bank's current notes all share a rather plain design of a view of Belfast harbour flanked by landscape views; the design of the reverse is dominated by the bank's coats-of-arms. The principal difference between the denominations is their colour and size.
  • 5 pound note, purple.
  • 10 pound note, blue-green.
  • 20 pound note, purple.
  • 50 pound note, blue.
A £20 Ulster Bank note
A £20 Ulster Bank note.

Description of British Coinage

Denomination Diameter Thickness Mass Composition Edge
1 penny / £0.01 20.03 mm 1.65 mm 3.56 g Copper-plated steel Smooth
2 pence / £0.02 25.90 mm 1.85 mm 7.13 g Copper-plated steel Smooth
5 pence / £0.05 18.00 mm 1.70 mm 3.25 g Cupro-nickel milled, wire or flat edge
10 pence / £0.10 24.50 mm 1.85 mm 6.50 g Cupro-nickel milled, wire or flat edge
20 pence / £0.20 21.40 mm 1.70 mm 5.00 g Cupro-nickel smooth, seven-sided
50 pence / £0.50 27.30 mm 1.78 mm 8.00 g Cupro-nickel smooth, seven-sided
1 pound / £1.00 22.50 mm 3.15 mm 9.50 g Nickel brass milled with variable inscription
2 pound / £2.00 28.40 mm 2.50 mm 12.00 g Inner: Cupro-nickel
Outer: Nickel-brass
milled with variable inscription

Depiction of British coinage - reverse side

1 penny
2 pence
5 pence
Portcullis with chains crowned, an adaptation of the Badge of Henry VII and now the Badge of the Palace of Westminster Three feathers being the
Badge of the Prince of Wales
A thistle crowned,
the Badge of Scotland
£0.01 £0.02 £0.05
 
10 pence 20 pence 50 pence
A lion crowned,
part of the crest of England
A crowned double rose,
the Badge of England
Britannia seated beside a lion
and holding a shield
£0.10 £0.20 £0.50
 
1 pound 2 pound
The edge lettering features the quotation "Standing on the Shoulders of Giants"by Sir Isaac Newton
Royal Arms representing
the United Kingdom
Design in four concentric circles depicts mankind's industrial and technological progress from the
Iron Age to the Internet
designed by Bruce Rushin
£1.00 £2.00 £2.00 edge

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Pre-decimal system

Pre-decimalisation, the pound was divided into 240 pennies (or pence) rather than 100, though it was rarely expressed in this way. Rather it was expressed in terms of pounds, shillings and pence, where:

£ 1
=
20 shillings (20s)
£ 1
=
1 quid
1 shilling
=
1 bob
1 shilling
=
12 pence (12d)
£ 1
=
240 pence
1 Gold Sovereign
=
£ 1
1 guinea
=
21 shillings
1 crown
=
5 shillings
half crown
=
2 and 6 (2s6d)
florin
=
2 shillings
1 farthing
=
¼ penny
  • The pound was originally the value of one pound (weight) of sterling silver (hence "pound sterling").
  • The name "shilling" is believed to come from the old Scandinavian word skilling, meaning a division, or a mark on a stick.
  • The name "sovereign" related to the majestic and impressive size and portraiture of the coin, the earliest of which showed the king facing, seated on a throne, while the reverse shows the Royal coat of arms on a shield surrounded by a Tudor double rose.
  • Guinea was not an official name for the coin, but much of the gold used to produce the early coins came from Guinea in Africa, the Africa Company having a charter which allowed them to put their symbol, an elephant or later an elephant and castle, beneath the king's effigy on the coins, and the term "guinea" originated from this.
  • The crown was originally known as the "crown of the double rose."
  • The name penny comes from the Old English pennige (roughly pronounced "penny-yeah"). It shares its roots with the German pfennig, which was a German denomination.
  • Florin was chosen, partly because of its connection with old English coinage, and partly because other European countries also had coins of approximately the same size and weight called florins.
  • Farthing means fourth part.

The penny was further subdivided at various times, though these divisions vanished as inflation made them irrelevant:

1 penny = 2 halfpennies and (earlier) 4 farthings (half-farthing, third-farthing, and quarter-farthing coins were actually minted in the late 1800s, but circulated only in certain British colonies and not in Britain itself).

Using the example of five shillings and sixpence, the standard ways of writing shillings and pence were:

5s 6d
5/6 (see below for the / mark)
5/- for 5 shillings only, with the dash to stand for zero pennies.

This sum would be spoken as "five shillings and sixpence" or "five and six."

The old abbreviation for the penny, d, was derived from the Roman denarius, and the abbreviation for the shilling, s, from the Roman solidus. The shilling was also denoted by the slash symbol, also called a solidus for this reason. The English penny was derived from a silver coin (the sceat of 20 grains weight) which was in general circulation in Europe during the middle ages. The weight of this coin was originally 20 grains but had reached 24 grains by the time of King Alfred (A.D. 871–899) or 1/240 of a troy pound, a weight known as a pennyweight—around 1.555 grams.

The pre-decimalisation coins with exact decimal equivalent values continued in use after 1971 alongside the new coins, albeit with new names, (e.g., the Shilling became the 5p coin, and the Florin equating to 10p). The others were withdrawn almost immediately but most of those that did have precise equivalents in the new system remained legal tender until they were replaced by smaller coins in the early 1990s. Pre-decimalisation shillings were used as 5p coins, with many people calling the new 5p coin a shilling, since it remained 1/20 of a pound, but was now worth 5p instead of 12d. The pre-decimalisation sixpence, also known as a sixpenny bit or sixpenny piece, was rated at 2½p but was demonetised in 1980.

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How the old system worked

Very conveniently, for those such as banks who handled coins in bulk, the weight of the pre-decimal coins bore exact relationships with each other:

  • two sixpences weighed the same as one shilling
  • four sixpences weighed the same as one florin (two shillings)
  • five sixpences weighed the same as one half-crown

Bronze coins were useful measures of weight and length.

The diameter of the halfpenny was almost exactly one inch, while five pennies placed side-by-side provided a reasonably accurate six-inch measure.

Three pennies or five halfpennies weighed one ounce.

Slang

Some pre-decimalisation coins or denominations became commonly known by slang terms, perhaps the most well-known being bob for a shilling and quid for a pound. A farthing was a mag, a silver threepence was a joey and the later cupro-nickel threepence was called a threepenny bit (pronounced threp'ny bit), a sixpence was a tanner and a half crown was a half dollar. Quid remains as popular slang for one or more pounds to this day in Britain in the form "a quid" and then "two quid" etc. thereafter.