Polling in Scotland appears to show a swing away from the 'yes' vote for independence, after several companies raised economic concerns.
A YouGov survey for the Sun and Times newspapers has the 'No' campaign leading 52 to 48.
Numbers last weekend appeared to show support growing for independence ahead of Scotland's referendum on Thursday.
But a series of banks have warned they may move operations out of Scotland and retailers say independence would lead to higher prices north of the border than in the rest of the UK.
Political reporter Theo Usherwood says economic concerns are more likely to be affecting the polls than visits by London politicians to Scotland to campaign for the UK to stay together.
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Historian Dr Tim Stanley says warnings from banks like RBS are more likely to be affecting the polls than visits by London politicians to Scotland to campaign for the UK to stay together.
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