With no difference among the candidates on Heathrow expansion, the Richmond Park by-election is purely about race.
Any election with Zac Goldsmith as a candidate is by definition about race.
That was what he chose, for the rest of his life, with his despicable campaign for Mayor of London.
The Labour candidate ought to be Barnaby Marder of Red Labour (Momentum for grown-ups). He only "can't win" if you don't vote for him.