Chief Secretary to the Treasury Danny Alexander has called on the Scottish Government to produce its own "realistic analysis" of the cost of independence as the Treasury prepares to publish its findings on the financial impact of a Yes vote.
Postal workers are to be urged by their union to vote against independence in Scotland.
The move was agreed at the annual 800-strong conference of the Communication Workers Union in Bournemouth, which has 17,000 members working on postal and telecoms services in Scotland.
A motion recommending "all members in Scotland that they vote 'no' in the forthcoming Scottish Independence Referendum" was passed at the conference in Bournemouth.
Two polls of members showed the majority of Scottish members would vote No (60%).
CWU general secretary Billy Hayes said: "We are recommending a 'no' vote to our Scottish members in September's Scottish Independence Referendum.
"This decision is based on a need for unity against austerity and the barrage of cuts from the coalition Government and the SNP in Scotland.
"This is an extremely important constitutional debate and it is crucial that as a trade union we are able to assist our members on the impact this will have on the Scottish economy and that of the rest of the UK.
"A 'no' vote would be in the best interests of our members."
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