Prime Minister Tony Blair is to take on the Scottish Nationalists in a passionate justification of the case for Scotland remaining part of the UK.
In a fighting speech to the Scottish Labour Party, Mr Blair will attack the economic case for independence and appeal directly to the "shared values" which Scotland and England have in common.
Aides said Mr Blair would combine a "passionate" defence of Scotland's union with England with an equally passionate attack on the policies of the SNP.
"Scotland should be proud, optimistic and confident and at a time of momentous challenge we should work together, not apart, with common hopes and shared values," they said.
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