Earlier quoted context omitted.
Scotland is fairly small country, starting their own currency does not make much sense. Monte Negro is using euro, and is not even part of EU yet https://en.wikipedia.org/wiki/Montenegro_and_the_euro
Scotland already has three banks issuing their own bank notes (backed by GBP on deposit in their vaults). Independence wouldn't change that, except that the names on the notes would have to be changed from Pounds Stirling.
Pounds Sterling.
Stirling is a city in Scotland.