Scottish independence: lessons from 1995 Quebec vote
4 April 2014 Last updated at 12:28 BST
There could be lessons for the Scottish independence debate from the 1995 Quebec referendum in Canada.
There, a nationalist party came to power, and decided to hold a referendum on independence, where the no campaign was ahead, but its lead started to dwindle as the campaign progressed.
In a Daily Politics film, Adam Fleming looked into the archive, and spoke to Prof Ailsa Henderson from the University of Edinburgh.