Chancellor George Osborne's expected to rule out the possibility of an independent Scotland keeping the pound when he makes a speech in Edinburgh later.
Nationalists say the UK government is bluffing and that a currency union is the best option.
More top news
Vigils will take place across the region tonight to remember those who fought in the Battle of the Somme 100 years ago.
In our Political Editor's latest blog; the Holyrood recess will be used to look at options for the future with the UK outside the EU.
45-year-old Stuart Wishart was killed when his motorbike collided with a tractor and trailer on Monday.