UK top tier to survive euro

HSBC, Barclays Capital and Royal Bank of Scotland are the biggest earners in UK forex. HSBC commands over 6% of total global wholesale market-client business, according to research firm ClientKnowledge, while BarCap and RBS have both built out global forex operations spread widely enough to counter the loss of sterling.

"Obviously we are a British bank and we have a lot of British-based clients," said Ivan Ritossa, global head of FX at BarCap in London. "But our business is as diversified as