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LONDON, ENGLAND - DECEMBER 02: Liberal Democrat leader Tim Farron (R) and Sarah Colney (C) speak to the media following Colney's victory in the Richmond Park by-election on December 2, 2016 in London, England. The Liberal Democrats caused a major upset in the Richmond Park by-election after ousting ex-Tory MP Zac Goldsmith who resigned his seat in protest at Heathrow airport expansion. (Photo by Carl Court/Getty Images)

LONDON, ENGLAND - DECEMBER 02:  Liberal Democrat leader Tim Farron (R) and Sarah Colney (C) speak to the media following Colney's victory in the Richmond Park by-election on December 2, 2016 in London, England. The Liberal Democrats caused a major upset in the Richmond Park by-election after ousting ex-Tory MP Zac Goldsmith who resigned his seat in protest at Heathrow airport expansion.  (Photo by Carl Court/Getty Images)