Pound sterling

The Pound Sterling — or, less formally, the pound, or quid (DW: Rose) — was a form of currency used in the United Kingdom through at least the early 21st century.

Unit of currency
Until 1971, the pound was divided with a system of twenty shillings to a pound and twelve pennies to a shilling. (DW: Remembrance of the Daleks)

Susan Foreman caught the attention of her teachers because of her inability to remember how many shillings were in a pound when the First Doctor and she settled in 1963 London. She believed Great Britain had switched to the decimalised Pound, something that would not occur until until 1971. (DW: An Unearthly Child)

Around the late 20th century or early 21st century Britain introduced a five pound coin. (DW: Battlefield)

The Third Doctor and Sarah Jane once discovered that they were in a parallel universe because £5 notes had a picture of Edward IX. (PHS: Who's Who?)

According to one account the UK was no longer using this currency by 2050, having switched to credits (K9TV: Oroborus) According to another, however, the UK had converted to the Euro some time before 2062. (NSA: The Last Dodo)

Known exchange rates

 * In 2008, £1 was worth slightly more than fifty Sto credits. (DW: Voyage of the Damned)
 * £1 was worth approximately 5.1 Hyspero Dirnas. (OBIW: The Panda Book of Horror)