What has happened in Holborn & St Pancras?
Around two months after announcing he was standing down as leader of the Labour party, Keir Starmer today revealed he would also give up his position as an MP. The former PM will instead focus on international affairs.
Once an MP resigns his seat a by-election is automatically triggered.
Who are favourites to win the Holborn & St Pancras by-election?
Labour are the strong favourites to win the by-election at 1.330/100 on the Betfair Exchange.
That's no surprise given they have won the seat at every election since it was created in the 1983 General Election.
Could Zack Polanksi finally become an MP?
If there is to be a surprise winner in the constituency it will be the Green Party.
The Greens are the second favourites in the betting at around 3.02/1 with every other party at bigger than 40.039/1.
And the Greens may choose to fight the by-election with current party leader Zack Polanksi, who is currently a member of the London Assembly but surely craves a seat on the national stage in parliament.
Polanksi is on the record as saying he will fight a by-election in London, where he has lived for the past two decades.
While Holborn & St Pancras is a Labour stronghold it is a plausible battleground for the Greens to target.
When will the by-election take place?
There is no set date at the time of writing. Once Starmer formally resigns a date will be set.