The North London based designer said the win was "completely overwhelming" and paid tribute to her children who were "fast asleep in England".
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If approved the increase would trigger a county-wide referendum.
Martin Gallagher was in Euston station when he saw Grace Georgina crying - she had lost her ticket and was unable to get home to Liverpool.
Always bound to raise a few eyebrows, the fourth plinth in Trafalgar square is one of the capital's most famous places to display artwork.