Former prime minister Sir John Major has warned the UK's international standing would be "diminished" should Scotland vote for independence.
Sir John said he hopes Scotland will not vote to break away when it votes on 18 September and warned it will lead to a decline in Britain's role on the international stage.
Writing in The Times (£), he said: "I believe Scotland and the whole of the UK as a whole would be damaged. We need one another and, if separated, would all face unwelcome and unanticipated change.
"The UK would be weaker in every international body and, most damagingly, within the European Union. Our chance of reforming the EU would be diminished, and the risk of our exit from it enhanced."
One story dominates Thursday's front pages with some newspapers printing emotive pleas to voters to keep the United Kingdom as one.
In Edinburgh tonight you can hear it and feel it. The buzz, the banter of the day and the thrilling sense something big is coming tomorrow.
There is nervousness, anxiety and on the streets of Edinburgh fuelled by an atmosphere unlike anything seen before in recent UK politics.