Alistair Darling has refused to give a yes or no reply to the question of whether Scotland could be a success as an independent country. ITV Border Political Editor Peter MacMahon has tweeted:
@alexsalmond says the answer is that we will use Sterling in a currency agreement. audience showing some scepticism over his replies
In his opening address, Better Together leader Alistair Darling has said the independence debate is not about "patriotism" but the future of the country.
He described the vote as the "biggest decision we've ever made" but warned "there is no going back" if the Yes campaign wins.
Mr Darling said Scotland must "use the strength of the UK to make Scotland stronger" and said: "We can have the best of both worlds" by staying in the union.
He vowed to ask Alex Salmond questions that "he hasn't answered yet" in the campaign.
A new poll has shown an increase in support for independence as the first televised head-to-head clash between campaign leaders Alex Salmond and Alistair Darling gets under way.
The Ipsos MORI poll for STV News showed a rise in support for the Yes campaign, while support for the Better Togther No campaign is unchanged.
Some 40% of those who said they were "certain to vote" said they supported independence - an increase of four percentage points from June.
The leaders of the rivalling Scottish independence campaigns are set to go head-to-head in front of the TV cameras in what could be a pivotal moment in the run up to the September 18 vote.
Scotland's First Minister and SNP leader Alex Salmond will front the case for independence, while former chancellor Alistair Darling will argue that the UK is Better Together in the debate organised by STV.
The debate, chaired by Bernard Ponsonby, will be broadcast live on ITV Border and online through the STV Player from 8pm.
With just hours to go until what could be a pivotal moment in the Scottish independence debate, the leaders of the Yes and No campaigns are gearing up to go head-to-head in front of the TV cameras.
SNP leader Alex Salmond will put the case for independence, while Alistair Darling, will argue that the UK is Better Together in the debate organised by STV.
Our Political Editor Peter MacMahon sent this report from Glasgow - where the debate is being held tonight.