Guido sources confirm that Zac intends to be a candidate in the by-election he is triggering in protest at the decision to build a new runway at Heathrow.

Richmond is traditional LibDem territory and may be receptive to a Remain/LibDem by-election putsch. CCHQ is worried that a post-Brexit LibDem revival would put Richmond and neighbouring constituencies back in the hand of the LibDems. Could we see the return of 73 year-old Vince Cable?

Will the Conservatives even put up a candidate against Zac and split the right-of-centre vote?