Sarah Olney (R), Liberal Democrat candidate in the upcoming by-election for Richmond Park, speaks with a member of the public whilst canvassing for votes in a residential neighbourhood in Richmond, south-west London on November 29, 2016.
A local by-election for parliament in the posh London suburb of Richmond on Thursday is threatening to turn into a mini-referendum on Brexit, with the defending MP a Brexiteer in a pro-EU heartland. Liberal Democrat challenger Sarah Olney, whose party wants a second referendum on Brexit, is hoping the result will shock Downing Street, as the government ploughs on towards the EU exit door. / AFP / Justin TALLIS        (Photo credit should read JUSTIN TALLIS/AFP/Getty Images)