<P> During the First World War the British Government wanted to maintain its stocks of gold and so banks were ordered to again stop exchanging any and all denominations of banknotes for gold . Gold sovereigns were replaced by one pound notes issued by the Treasury . These notes were nicknamed "Bradburys" because of the prominent signature of Sir John Bradbury, Permanent Secretary to the Treasury displayed on the notes . Britain returned to the gold standard in 1925, although the Bank of England was only obliged to exchange notes for gold in multiples of 400 troy ounces (12,000 g) (the typical size of a "Good Delivery bar") or more . The responsibility for the printing of one pound notes was transferred to the Bank of England in 1928, and the ability to redeem banknotes for gold ceased in 1931 when Britain stopped using the gold standard . </P> <P> The Bank of England's first post-World War I one pound notes were two - sided green notes which were printed--not handwritten . The name of the payee was replaced by the declaration "I promise to pay the bearer on demand the sum of one pound". This declaration remains on Bank of England banknotes to this day . This signature of the issuing cashier was replaced by the printed signature of the Chief Cashier of the Bank of England . In 1940, following the outbreak of the Second World War, one pound notes were issued in a new blue - orange colour scheme to deter counterfeiters, although the design remained the same . At the same time, metal thread running the paper was introduced as a security feature . After the war one pound notes were issued in their original green colour . The earliest post-World War II notes did not have the metallic thread security feature, but those issued from September 1948 onward did . </P> <P> A new design for one pound notes was introduced in 1960, with the old notes ceasing to be legal tender in 1962 . These new series C notes were slightly narrower, and were the first one - pound notes to feature a portrait of Queen Elizabeth II on the front . The reverse design incorporated the logo of the Bank of England . Series C notes were replaced by the series D notes from 1978 onward . These slightly smaller notes featured an entirely new design with Queen Elizabeth II on the front and scientist Isaac Newton on the back . The note was redesigned slightly in 1981 to feature brighter background colours . Following a consultation with retailers and other groups it was announced on 31 July 1981 that the one pound note would be replaced by a one pound coin . Part of the reason for this change was that notes, on average, lasted only nine months in general circulation, while coins could last forty years or more . The government also believed that the growing vending industry would benefit from the introduction of a one - pound coin . The new cupro - nickel coin was introduced on 21 April 1983 and the one pound note ceased to be legal tender on 11 March 1988 . Bank of England £ 1 notes are still occasionally found in circulation in Scotland, alongside Royal Bank of Scotland £ 1 notes . This is because Scotland has no concept of Legal Tender, and any Sterling bank note, of any age, may be used provided the trader is content to accept it . The Bank of England will exchange old £ 1 notes for their face value in perpetuity . </P> <Table> <Tr> <Th> Note </Th> <Th> First issued </Th> <Th> Last issued </Th> <Th> Ceased to be legal tender </Th> <Th> Colour </Th> <Th> Size </Th> <Th> Design / Picture </Th> <Th> Additional information </Th> </Tr> <Tr> <Td> White </Td> <Td> 2 March 1797 </Td> <Td> 1821 / 1825--6 </Td> <Td> Unknown </Td> <Td> Monochrome (printed on one side only) </Td> <Td> 200mm x 113mm (may vary) </Td> <Td> </Td> <Td> </Td> </Tr> <Tr> <Td> 1st Series Treasury Issue </Td> <Td> 7 August 1914 </Td> <Td> Unknown </Td> <Td> 12 June 1920 </Td> <Td> Black on White (printed on one side only) </Td> <Td> 127 × 64 mm </Td> <Td> Designed at Royal Mint from sketches by Frederick Atterbury . Signed by Sir John Bradbury </Td> <Td> </Td> </Tr> <Tr> <Td> 2nd Series Treasury Issue </Td> <Td> 23 October 1914 </Td> <Td> Unknown </Td> <Td> 12 June 1920 </Td> <Td> Black on White (printed one side only) </Td> <Td> 149 × 83 mm </Td> <Td> George Eve . Printed by LA Rue & Co on banknote paper . </Td> <Td> </Td> </Tr> <Tr> <Td> 3rd Series Treasury Issue </Td> <Td> 22 January 1917 </Td> <Td> Unknown </Td> <Td> 1 August 1933 </Td> <Td> Brown & Green </Td> <Td> 151 × 84 mm </Td> <Td> Front: Britannia; Back: Bank of England </Td> <Td> Reissue of unthreaded pre-war notes </Td> </Tr> <Tr> <Td> Series A (1st issue) </Td> <Td> 22 November 1928 </Td> <Td> Unknown </Td> <Td> 28 May 1962 </Td> <Td> Green </Td> <Td> 151 × 85 mm </Td> <Td> Front: Britannia; Back: Saint George and the Dragon </Td> <Td> </Td> </Tr> <Tr> <Td> Emergency wartime issue </Td> <Td> 29 March 1940 </Td> <Td> Unknown </Td> <Td> 28 May 1962 </Td> <Td> Pale blue and orange </Td> <Td> 151 × 85 mm </Td> <Td> Front: Britannia; Back: Saint George and the Dragon </Td> <Td> Incorporated metal thread for the first time; same design as series A </Td> </Tr> <Tr> <Td> Series A (2nd issue) </Td> <Td> 17 June 1948 </Td> <Td> Unknown </Td> <Td> 28 May 1962 </Td> <Td> Green </Td> <Td> 151 × 85 mm </Td> <Td> Front: Britannia; Back: Saint George and the Dragon </Td> <Td> Reissue of unthreaded pre-war notes </Td> </Tr> <Tr> <Td> Series A (3rd issue) </Td> <Td> 13 September 1948 </Td> <Td> Unknown </Td> <Td> 28 May 1962 </Td> <Td> Green </Td> <Td> 151 × 85 mm </Td> <Td> Front: Britannia; Back: Saint George and the Dragon </Td> <Td> Metal thread introduced permanently </Td> </Tr> <Tr> <Td> Series C </Td> <Td> 17 March 1960 </Td> <Td> 1978 </Td> <Td> 31 May 1979 </Td> <Td> Green </Td> <Td> 151 × 72 mm </Td> <Td> Front: Queen Elizabeth II; Back: Bank of England logo </Td> <Td> First £ 1 note to carry portrait of monarch </Td> </Tr> <Tr> <Td> Series D </Td> <Td> 9 February 1978 </Td> <Td> 31 December 1984 </Td> <Td> 11 March 1988 </Td> <Td> Predominantly green </Td> <Td> 135 × 67 mm </Td> <Td> Front: Queen Elizabeth II; Back: Isaac Newton </Td> <Td> Those issued from 20 March 1981 onward featured additional background colours . </Td> </Tr> </Table>

When did pound notes stop being legal tender