Alistair Darling will be reunited with former prime minister Gordon Brown today as the two men join forces to campaign to keep Scotland in the United Kingdom.
Mr Darling, leader of the pro-UK Better Together campaign, served as chancellor when Mr Brown was in charge at 10 Downing Street.
With ballots already being sent out to the hundreds of thousands of Scots who have asked to vote by post in the September 18 referendum, the two will speak out at a special rally aimed at this section of the electorate.
Speaking ahead of the event, Better Together campaign director Blair McDougall said: "For the hundreds of thousands of Scots who will make up their minds and vote over the next few days the big questions are the economic ones. Gordon and Alistair two of the biggest economic figures in the UK.
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