As he promised to do, Zac Goldsmith has resigned his seat in protest at the Government’s decision to approve Heathrow expansion, forcing a by-election on the issue.

The Huffington Post has a copy of the announcement sent out to members of Goldsmith’s local association:

As I wrote yesterday, the outcome of such a by-election is not a foregone conclusion if the Tory vote splits and the Lib Dems somehow manage to make a successful pitch to disgruntled Remainers.