The Spice Girls (from left to right) Melanie Brown (Mel B), Melanie Chisholm (Mel C), Geri Halliwell, Emma Bunton and Victoria Beckham
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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".