Countries can use anothers currency but have little control over it. If the owner devalues it there is nothing they can do about it. You are controlled by the owning country.
It is a threat against the Scots that may backfire...If I was Scot I would vote just to show I can't be threatened.
It is difficult to imagine the UK would stop the Scots using the pound, the cost to UK business would also be gigantic.
Scotland could become a very nice country free from the racist UKIP / Tory nonsense of England.
Wales next
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