Black Wednesday: The British pound is forced out of the European Exchange Rate Mechanism by currency speculators and is forced to devalue against the German mark.

Black Wednesday, or the 1992 sterling crisis, was a financial crisis that occurred on 16 September 1992 when the UK Government was forced to withdraw sterling from the (first) European Exchange Rate Mechanism , following a failed attempt to keep its exchange rate above the lower limit required for ERM participation. At that time, the United Kingdom held the presidency of the Council of the European Union.

The European Exchange Rate Mechanism (ERM II) is a system introduced by the European Economic Community on 1 January 1999 alongside the introduction of a single currency, the euro as part of the European Monetary System (EMS), to reduce exchange rate variability and achieve monetary stability in Europe.