George Soros, the world's most famous financier who famously "broke the Bank of England," has warned of the dangers facing the currency if Scotland became independent.
Speaking at an event in London, he told ITV News that Scotland would have a "very difficult relationship" with the rest of the UK if it tried to keep sterling and it "would not be practical" for Scotland to remain with the Bank of England.
However, he also warned it would be "inefficient and potentially dangerous" for Scotland to create its own currency, because "currencies can be attacked and speculated against. And when you have a weak currency, positions can be taken".
Instead, Mr Soros said Scotland should "seek membership of the European Central Bank [ie the euro]".