Scottish independence: Cameron and Miliband will miss PMQs
The decision of party leaders to miss Wednesday's prime minister's questions session was "pretty dramatic and shows just how concerned they are" says the BBC's political editor.
Nick Robinson said there was a "degree of anxiety" that voters in Scotland were about vote "to end Britain as we know it".
David Cameron and Ed Miliband are due to head to Scotland to campaign on the referendum.
William Hague and Harriet Harman will stand in for their leaders at PMQs.
09 Sep 2014