Chief Secretary to the Treasury will reaffirm the UK's stance against sharing the pound with an independent Scotland.
The cross-party decision to refuse to share the pound is final - that's according to the Chief Secretary to the Treasury.
Liberal Democrat Danny Alexander will use a speech to business leaders in Edinburgh to say the UK won't change its mind.
A group commissioned by the Scottish government recommends a formal monetary union as the best option for an independent Scotland - with "clear advantages" for the rest of the UK.
But Chancellor George Osbourne, Shadow Chancellor Ed Balls and Mr Alexander ruled that out last month.
Pro-Yes campaigners believe the Westminster parties are "bluffing" ahead of September's vote.
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