Русско-англо-русский юридический словарь

It [Scotland] examines three currency options: being part of a sterling currency zone, adopting the euro, or having an independent currency. (BBC News)

So the fear would be that Scotland would adopt a new currency whose value would fall, relative to sterling.

Now the biggest anxiety stemming from this foreign exchange risk is that banks lending in Scotland could incur big losses, because they would be receiving repayment of loans in a soft and falling new Scottish currency, and the amount they would receive in repayments would not match what they owe depositors and other creditors in solid and rising sterling. (BBC News)