The UK Government will today reveal the advice it has been given on what would happen if Scotland became independent from the rest of the UK.
According to Professors James Crawford and Alan Boyle, who set out their opinions in the paper, Scotland would be treated as a new country, having to renegotiate its relationship with world bodies.
The Scottish Government issued a paper last week, which assuming a Yes vote occurred in autumn 2014, could see negotiations between Scottish ministers and the UK Government, EU and international organisations concluded by March 2016.
Today's publication does not include specific advice from the European Commission on the implications of Scottish independence in the EU.
David Cameron has launched a defence of the United Kingdom as his government prepares to put the "facts" about Scottish independence to the public.
While people in Scotland will make the decision in autumn next year, the implications will have obvious impacts across England, Wales and Northern Ireland, the Conservative leader said.
"Britain is admired around the world as a source of prosperity, power and security," he said.
"Those glorious Olympics last summer reminded us just what we were capable of when we pull together: Scottish, English, Welsh, Northern Irish, all in the same boat - sometimes literally.
"If you told many people watching those Olympics around the world that we were going to erect barriers between our people, they'd probably be baffled. Put simply: Britain works. Britain works well. Why break it?"
Cameron spoke out one day before the government publishes the first in a series of analysis papers about Scotland's role in the union.
Alex Salmond has said in an interview that no deal has been done as far as the referendum question is concerned.He added that it has been unwise for to suggest there was and that although progress has been made there are still a number of issues that need to be ironed out.
But he hopes that next week the deal can be finalised.He is expected to meet with the Prime Minister David Cameron on Monday (15th October).
Scotland's First Minister is expected to meet with the Prime Minister in the next few weeks to conclude the discussions about the terms of a vote.
He said independence would give Scotland the powers needed to promote jobs and growth.
He told MSPs, "I believe an independent Scotland is a fairer as well as weathier one."
A controversial bill on same - sex marriage will also be brought forward. It will be subject to a free 'conscience' vote in the parliament.
"No faith group will be required to take part in a same- sex ceremony unless they wish to do so. This is the apppropriate thing to do to respect religious and private beliefs, while ensuring equality."