Prime Minister David Cameron said: "This is a massive vote of confidence in our long-term economic plan.
"This investment is going to create lots of new jobs and opportunities, meaning more financial security and peace of mind for families and a more resilient economy for our country."
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The Met Office has weather warnings in place for snow and ice until 10am in the north and west.
The plan, which would effectively strip banks of the benefit of recent corporation tax cuts, forms part of the party's election manifesto.
Pop star went into the icy waters of Chicago's Lake Michigan at a fundraiser for the Special Olympics and later said "her weave froze".