The Conservatives are planning the "wholesale devolution of income tax" as part of their 2015 general election manifesto, the party's Scottish leader has said.
Ruth Davidson was speaking after the publication of a new report calling for the Scottish government to take on a range of new tax-raising powers that will bolster its standing relative to the UK Government in Westminster.
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Temperatures will remain close to freezing.
The prime minister's announcement came as international leaders gather in Paris on the second anniversary of the climate change plan.