Former prime minister Sir Keir Starmer is to step down as the MP for Holborn and St Pancras, a move that will trigger a by-election in the London seat. Sir Keir Starmer said he plans to focus on international affairs (Picture: Wiktor Szymanowicz/Future Publishing via Getty Images) Former Prime Minister Sir Keir Starmer has announced he will step down as an MP, triggering a by-election in his north London seat. Key points and original sources are listed below.

• Former prime minister Sir Keir Starmer is to step down as the MP for Holborn and St Pancras, a move that will trigger a by-election in the London seat.S1

• Sir Keir Starmer said he plans to focus on international affairs (Picture: Wiktor Szymanowicz/Future Publishing via Getty Images) Former Prime Minister Sir Keir Starmer has announced he will step down as an MP, triggering a by-election in his north London seat...S2

• The former prime minister said he would now turn his focus to international affairs.S3