Britain's former Prime Minister Gordon Brown and ex-Chancellor Alastair Darling made a last-ditch attempt to woo voters for the Better Together campaign ahead of Scots going to the polls to decide the future of their country on 18 September.

An Ipsos Mori poll for STV showed a seven-point surge in "Yes" support since last month but it was not enough to secure the top spot.

Currently, the "No" vote is at 51%, while the "Yes" vote at 49%.

Gordon Brown Labour Scottish Independence Rally
Former British prime minister Gordon Brown speaks at a party rally in Glasgow, Scotland. The referendum on Scottish independence will take place on Thursday, 18 September, when Scotland will vote whether or not to end the 307-year-old union with the rest of the United Kingdom. Paul Hackett/Reuters

Other polls by PanelBase and ICM have put the "No" vote in the lead by four points but is it enough to secure a victory for the union?

"We built the peace together, we built the health service together, we built the welfare state together, we will build the future together," said Brown.

"And what we have built together, by sacrificing and sharing, let no narrow nationalism split us under, ever."

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