A "spokesman" for Mr Cameron has said that Scotland could be "forced" to join the Euro if it insists on independence.
What does he think Alex Salmond is going to do? "Oh well, that's it lads. That Eton and Oxford education was too much for me. Call me has outwitted us. We'll just have to scrap any idea of independence"?
Yeah, that's likely!
In more civilized times, with far more civilized and intelligent leaders, Ireland was granted independence from the United Kingdom (although it took a war to make it happen) and carried on within the sterling area. There was no rush to throw Ireland out of the sterling area and the Irish Pound stayed pegged to the English pound until the advent of the ERM.
Here is a part of the Wikipedia page on the subject.
"Despite increasing political independence from each other from 1922 and complete political independence since the new constitution of 1937, the union left the two countries intertwined with each other in many respects. Ireland used the Irish pound from 1928 until 2001 when the euro replaced it. Until it joined the ERM in 1979, the Irish pound was directly linked to the pound sterling. Decimalisation of both currencies occurred simultaneously on Decimal Day in 1971. Coins of equivalent value had the same dimensions and size until the introduction of the British twenty pence coin in 1982,.
"Irish citizens in the UK have a status almost equivalent to British citizens. They can vote in all elections and even stand for Parliament. As well as this, some people born in the Republic of Ireland before 1949, but after 3 March 1922, are British subjects. British citizens have similar rights to Irish citizens in the Republic of Ireland and can vote in all elections apart from presidential elections and referendums. Under the Irish nationality law anyone born on the island of Ireland to a British or Irish parent can have Irish citizenship and so most children born in Northern Ireland can have a British or an Irish passport (or both). Before 2002, there was no requirement for one parent to be a British or Irish citizen and so all persons born on the island of Ireland before then are entitled to be Irish citizens."
So why does Cameron insist on behaving like a spoilt child? There is absolutely no need, nor is there a precedent, for Scotland to leave the sterling area immediately.
Can Cameron possibly think that threatening to force Scotland into a currency that is wobbling dangerously on the edge of extinction and which might not even exist by the time the referendum has come and gone, is a clever move on his part? Frankly I think it's a dumb as a stump.
But John Swinney will already have contingency plans in place for this eventuality, whether that is starting out own currency or working with another country like Norway.
Message to Cameron: If you want to behave like an 8 year old who isn't getting his own way, take your bloody ball and sod off home. We'll get our own ball.