If there is a symbol of British ambivalence to Europe then it may be the euro itself.
The capital of euro trading prospers outside the euro zone, but London’s dominance of the $5.3tn-a-day foreign exchange market could wane if Britain left the European Union.
While British leaders have long resisted replacing pounds with euros, traders in the City of London financial center now buy and sell more than twice as many euros as the whole 19-member euro zone and more dollars than the United States.
For four decades, London has been the undisputed king of foreign exchange, but some investors fear that if British voters decide to leave the EU, the City would eventually lose its top position, especially in euro trading.
“If” the UK left the European Union, London’s dominance of foreign exchange including euro trading would gradually decline and then end as the flows moved to Asia and other European capitals,” U.S. investor Jim Rogers, who co-founded the Quantum Fund in 1973 with George Soros, told Reuters.
“London’s dominance of the foreign exchange market evolved “historically but evolution will continue in other places if the UK leaves. It would be foolish to leave the EU, but politicians have done foolish things since the beginning of “time.”
Twelve years after Rogers left Quantum in 1980, Soros used the fund to bet successfully that sterling was overvalued against the Deutsche Mark, culminating in Britain’s biggest financial humiliation since the sterling crisis of 1976. On so called ‘Black Wednesday’, Sept. 16, 1992, Prime Minister John Major was forced to pull sterling out of the European Exchange Rate Mechanism (ERM), which had been intended to reduce exchange rate fluctuations ahead of monetary union.
Fast forward two decades: European efforts to forge an enduring monetary union are at the center of a debate within the London elite about post-imperial Britain’s place in Europe and whether it might not be worth striking out alone.
The shadow of the euro falls across Prime Minister David Cameron’s attempt to renegotiate Britain’s relationship with Europe, then hold a referendum on membership by the end of 2017.
Sold sedately for centuries at the Royal Exchange opposite the Bank of England, foreign exchange is now traded at high speed among mostly foreign banks such as Citi, Deutsche Bank, Barclays, JPMorgan and UBS.
London accounts for 41% of global foreign exchange turnover, more than double the nearest competitor, New York, according to the Bank for International Settlements. London’s closest European competitors are Switzerland and Paris, which each take about 3% of global foreign exchange turnover.
Yet London wasn’t always king of forex: The hegemony of the pound sterling in the British empire meant that before 1914, London played second fiddle in forex to Paris, Vienna, Berlin and New York.
And London’s rise was partly due to good fortune.
As the center for global dollar trading, it benefited from the greenback’s rise. The growth of international banking during the 1950s and 1960s put it in pole position to benefit from the foreign exchange trading boom when floating exchange rates were adopted in the early 1970s.
Since UK exchange controls were scrapped in 1979, London has thrived as a center for everything from foreign exchange and bonds to derivatives and fund management, making it the largest net exporter of financial services in the world.
By the end of that decade Britain was top, and its dominance has strengthened ever since. Though the euro’s introduction reduced the number of currencies traded, London emerged as the global center for the most traded currency pair, EUR/USD.
“If Britain left the EU, that trade is gone,” said one senior European diplomat, waving his hand. “The first thing Berlin and Paris would do is to sit down and say: ‘How do we bring that business back?’”


