Nicola Sturgeon, the woman expected to replace Alex Salmond as leader of the Scottish National Party and Scotland's First Minister, said she could start resurrecting plans for a fresh referendum on Scottish independence as soon as 2016.

Speaking today, Ms Sturgeon said that a "clear and unmistakable pledge" had been made that the package for Scotland would be "something near to federalism", and failure to implement them would result in a "heavy political price."

Let me say this to Westminster on behalf of Scotland - it had better be. If the UK parties move forward in that spirit, they will have, in me, a willing partner for progress. Nicola Sturgeon

She said if promises made in the run up to the vote aren't met by the time of the next elections for the Scottish parliament, she will "follow the mood of the people."

Scotland Correspondent Debi Edward reports.