A new survey from YouGov for Sky News suggests that almost two-thirds of voters are in the dark about what devolved powers would be given following a NO vote.

The survey comes after the leaders of the three main parties at Westminster signed a pledge to give "extensive new powers" to Holyrood in the event of a No vote.

The unique study of nearly 2,400 Scots found that despite political disagreement over Scotland's right to keep the pound - voters were less uncertain about currency than the subject of devolution.

On whether an independent Scotland would be able to keep the pound, 57% were clear and 38% unclear, with 5% "don't knows".

On what devolved powers would be given to Scotland if it remained in the United Kingdom, 33% were clear while 61% were unclear.

The findings come on the last day of campaigning before voters north of the border go to the polls on Thursday to decide the country's future.

The poll suggests pro-independence campaigners claim to have more clarity over disputed areas of the debate - such as currency.

Some 80% of Yes voters said they were clear over whether Scotland would keep the pound.

This morning, the First Minister Alex Salmond has written to voters urging them to back independence. However, the Better Together camp insists splitting with the UK means greater uncertainties.

Three new surveys published a day before Scotland's independence referendum all say it's too close to call before polls open.