The former prime minister said he would be turning his concentration to international affairs
GlobeSignal-AImedium certainty
Why it matters
Starmer's parliamentary seat will become vacant, triggering a by-election in his constituency and requiring his replacement in the House of Commons.
Most affected
Voters in Starmer's constituency — Must participate in a by-election to fill the now-vacant seat. The Labour Party — Loses a sitting MP and must defend a constituency seat in a by-election.
Likely next
The date Starmer formally submits his resignation and when the by-election is called for his constituency.