The terms of a referendum, giving Scots the chance to choose independence from the United Kingdom, will be formally approved in Edinburgh today.
Scotland's first minister Alex Salmond will sign the agreement with Prime Minister David Cameron, for a vote to be held in two years' time.
The BBC's political editor Nick Robinson and BBC Scotland's political editor Brian Taylor explained that the terms under which the referendum will be held, are crucially important to its outcome.
And talking to the Today programme's John Humphrys, Scottish MP Michael Moore argued that being part of the UK provides Scotland with security. "When two of our biggest banks - RBS and Bank of Scotland - collapsed, it was the strength and size of the UK economy that helped us to cope."
"If you look at our businesses", he added, "we export twice as much to England as we do to any other part of the world.
"Why would you put barriers up between us?"
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