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.
Police have arrested six people after trouble between independence and pro-unionist campaigners in Glasgow's George Square.
Officers, some on horses, separated the groups as hundreds flocked to the square following Scotland's No result in the referendum.
No campaigners, draped in union flags, let off a flare before singing Rule Britannia.
Reports on social media of a stabbing and that a fire next to the Glasgow Herald offices had been started by protesters proved inaccurate.
Police said the numbers gathered quickly fell by around 1am.
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.