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Newly elected Liberal Democrat MP for Richmond Park Sarah Olney (L) listens to Independent candidate Zac Goldsmith (R) speaking after Olney won her seat in Richmond, south-west London, on December 2, 2016 after votes have been counted in a by election. Former MP Zac Goldsmith triggered the by election by resigning after the government gave the go ahead for a third runway at Heathrow airport. Sarah Olney's Liberal Democrat party want a second referendum on Brexit. / AFP / Justin TALLIS (Photo credit should read JUSTIN TALLIS/AFP/Getty Images)

Newly elected Liberal Democrat MP for Richmond Park Sarah Olney (L) listens to Independent candidate Zac Goldsmith (R) speaking after Olney won her seat in Richmond, south-west London, on December 2, 2016 after votes have been counted in a by election. 
Former MP Zac Goldsmith triggered the by election by resigning after the government gave the go ahead for a third runway at Heathrow airport. Sarah Olney's Liberal Democrat party want a second referendum on Brexit.  / AFP / Justin TALLIS        (Photo credit should read JUSTIN TALLIS/AFP/Getty Images)