Keir Starmer's honeymoon period ends when Parliament reconvenes. The new Labour prime minister has spent the summer on the road, selling his vision for change to the public through campaign events and media appearances. Now he faces the unforgiving scrutiny of the House of Commons, where opposition parties and his own backbenchers will demand answers on policy delivery, economic management, and the promises he made during the campaign.

The shift from campaign mode to governance is stark. On the stump, Starmer controls his message, chooses his audiences, and frames issues on favorable terrain. In Parliament, he sits across from Rishi Sunak's successor at Prime Minister's Questions, facing hostile cross-examination twice weekly. Conservative MPs will hammer him on inflation, NHS waiting times, and cost-of-living pressures. Liberal Democrats will probe for vulnerabilities. His own backbenchers, emboldened by Labour's decisive election victory, will test the limits of his authority.

The timing matters. Starmer enters this parliamentary session with a substantial majority, but momentum from a general election fades quickly. The public's expectations are high. Labour campaigned on being the party of change, of ending "fourteen years of Conservative chaos," of delivering tangible improvements to public services. Parliament is where those abstractions must become concrete policy.

Key flashpoints loom. The government's approach to public sector pay, particularly for nurses and teachers, will dominate early sessions. Energy policy and how Starmer handles the cost-of-living crisis will draw sustained fire. Immigration remains a volatile issue where Labour's position differs from the Conservatives but faces pressure from both wings of the political spectrum. The party has also pledged action on NHS reform and children's services, areas where delivery is complex and visible.

Starmer's performance at PMQs will set the tone. He must demonstrate command of his brief, project authority without arrogance, and articulate clear answers to pointed questions. A stumbling performance early on invites derision and emboldens backbench rebels. A confident one establishes him as a serious operator ready to lead.

The summer tour allowed Starmer to consolidate his political position and build narrative momentum ahead of a general election that was never in doubt once he took Labour's helm. Parliament represents a different arena entirely. Campaign rhetoric collides with the constraints of governing. MPs will scrutinize every policy announcement, every spending commitment, every deviation from campaign pledges. The real work of proving that Labour can deliver on its promises begins now.