Labour leader Ed Miliband has written on Twitter ahead of his speech in Scotland:
My message on #gms: vote No on the 18th, and vote for a Labour govt in May to bring social justice and change to the whole of Britain.
The SNP are offering Tory policies - cutting taxes for corporations, cutting spending on schools & hospitals.
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Read the letter carefully, don't worry, it's short. Note that while it praises the Conservative-led government it does not mention Labour.