Despite David Cameron's assurances that he will govern Scots with respect, Vince Cable has told the Lib Dem Conference Fringe that a future Conservative Government will face a constitutional crisis that will threaten the United Kingdom.

"In a few years time, assuming that as some people do the Conservatives win the next general election, we will face a constitutional crisis in the UK," he told a packed fringe meeting hosted by the Guardian.

"There is a serious threat of a scenario coming where we would get a Conservative government with probably one of two Scottish MPs, but with no mandate north of the border."

...

Mr Cable argued the Lib Dem's commitment to a federal system of government with fully devolved governments was the only solution to the current tension.

"Unless we grasp this we will see a constitutional crisis that could ultimately lead to the secession of Scotland from the union," he concluded.

"We could end up with a break up of the UK."

One such crisis in the making is Alex Salmond's insistence that the Scottish Government would use its devolved powers to block new nuclear weapons coming to Scotland.

If the Conservatives form the next UK Government but only have one or two Scottish MPs, as Vince Cable forewarns, will their lack of a Scottish mandate precipitate a constitutional crisis?