George Osborne is "bluffing" when he insists an independent Scotland cannot keep the Pound, according to Scottish First Minister Alex Salmond.
But when speaking to ITV News Chief Secretary to the Treasury Danny Alexander accused Salmond of bluffing too, claiming he has no currency plan.
Both sides of the debate are now firmly entrenched, reports Martin Geissler:
More top news
"Important clarity" or the grounds for the "theft of democracy"? The PM's declared aims for negotiations have received a mixed response.
A divided theme across the UK today
400 people will run for mental health charity Heads Together, which was set up by William, Harry and Kate.