British Finance Minister George Osborne issued a stern warning to the Scottish government ahead of a referendum on independence.
Osborne was clear: No union, no pound.
Three UK political parties have also launched a campaign against the plans for independence.
On Inside Story we ask: Could Scotland really become an independent state? And what does it all mean for the UK as a whole?
Presenter: Shihab Rattansi
Guests: Jim Gallagher: a fellow at Nuffield College, Oxford
Angus Armstrong: a fellow at the Economic and Social Research Council
Allan Grogan: head of Labour for Independence, a group of pro-independence supporters of the Labour Party