David Cameron has admitted he "contemplated having to go" if Scotland voted for independence.
The Prime Minister said he would have been "heartbroken" by the break-up of the UK and considered his position when polls put the Yes campaign ahead just days before the referendum.
The head of the Better Together campaign, Alistair Darling, has paid tribute to his former opponent, Alex Salmond, following his recent decision to step down as First Minister.
Mr Darling told the BBC's Andrew Marr Show: "He is a very formidable politician. He's brought his party from being a fringe sort of protest movement and he's got them into government."
"He's a divisive politician, this is the nature of the beast, if you like. Alex Salmond, he's got his place in history, I'm sure that's what he wanted and that's what he'll get," the former Chancellor added.
The woman expected to replace Salmond said she will "follow the mood of the people" if promises made in the run up to the vote are not met.
The double Grand Slam winner said he did not regret giving his opinion, but was 'disappointed' at the way he went about it.
Alex Salmond has announced his intention to end a 24-year career at the forefront of Scottish politics. Here is a brief look at his career.