On 18 November 1967, the UK devalued the pound from $2.80 to $2.40. This highlighted how hard it was to keep a fixed exchange rate when markets doubted a country’s ability to defend it. The episode set the stage for later moves away from fixed parities toward more flexible exchange rates.
On 15 February 1971, the UK decimalised its currency, moving from pounds–shillings–pence to 100 new pence per pound. While this did not determine the exchange-rate regime, it was a major modernization of the monetary system during a period of wider economic change. It also helped standardize pricing and accounting as the UK economy became more internationally integrated.
In September 1971, the Bank of England introduced “Competition and Credit Control” (CCC), aiming to steer monetary conditions more through market mechanisms like interest rates and open-market operations. This was a break from tighter, direct lending controls on banks. The shift mattered because managing a floating currency typically depends more on interest-rate and liquidity policy.
On 23 June 1972, the UK government announced that, as a temporary measure, sterling would be allowed to float rather than stay within set trading limits. The decision followed heavy speculative pressure and large-scale central bank intervention that was draining reserves. This move put the pound on a more flexible exchange-rate path, with the market playing a larger role in setting its value.
In 1976, sterling came under severe pressure amid high inflation and weak confidence, contributing to a major currency crisis. The UK sought IMF assistance, with a widely cited figure of about $3.9 billion discussed at the time. The crisis reinforced how a floating currency can still be vulnerable if markets doubt domestic economic policy.
The Banking Act 1979 received Royal Assent on 4 April 1979 and came into force on 1 October 1979, expanding the Bank of England’s powers over deposit-taking institutions. It followed financial strains including the secondary banking crisis of the mid-1970s. Stronger supervision mattered for a liberalized, floating-rate economy where banking stability affects confidence in the currency.
On 23 October 1979, the UK abolished remaining foreign exchange controls, removing many restrictions on moving money across borders. This made sterling more exposed to global capital movements—both supportive inflows and destabilizing outflows. It also aligned the UK more closely with liberalized international financial markets.
On 27 October 1986, major reforms—often called the “Big Bang”—deregulated key London Stock Exchange practices, including fixed commissions and old trading roles. The changes helped London compete more aggressively as a global financial center. A larger, faster-moving financial sector increased the speed at which market sentiment could affect sterling.
Sterling entered the European Exchange Rate Mechanism (ERM) on 8 October 1990, with a central rate described against the Deutschmark at DM 2.95 and wider initial bands. The ERM aimed to limit exchange-rate swings between participating European currencies. For the UK, joining meant giving up some freedom of a pure float in exchange for an exchange-rate “anchor” intended to help curb inflation.
On 7 February 1992, European Community states signed the Maastricht Treaty, setting a course toward deeper economic integration and a future single currency. The treaty increased the political and economic importance of exchange-rate stability in Europe. For the UK, this raised the stakes of ERM membership by tying exchange-rate debates to wider questions about Europe’s monetary future.
On 16 September 1992, the UK suspended its membership in the ERM after heavy market selling and failed efforts to defend sterling, including major interventions and emergency interest-rate moves. The day became known as “Black Wednesday.” The episode showed that a pegged exchange-rate commitment can break if markets believe domestic policy and the peg are incompatible.
After leaving the ERM in September 1992, sterling was no longer managed within the ERM’s set bands and could move more freely in foreign exchange markets. This marked the closing outcome of the UK’s 1972–1992 arc: from floating, to re-pegging in the ERM, and then back to floating after a failed defense. The result was a clearer separation between domestic interest-rate policy and fixed exchange-rate obligations.
United Kingdom: Sterling Float and Black Wednesday (1972-1992)