To ask His Majesty's Government whether they will publish the metrics of each of the four tests that proposed schemes to expand Heathrow Airport will have to meet, and if so, when.

On 22 October the Government formally commenced the review of the Airports National Policy Statement (ANPS), which provides the primary basis for decision-making on whether to grant development consent for a new runway at Heathrow. The review will reflect important changes in legislation, policy, and data and set the four tests that any proposed scheme must meet on economic growth, climate, air quality and noise.

As part of the review, the Government will develop analysis on the economic and environmental impacts of expansion at Heathrow, which will inform the four tests. We expect to publish any revisions to the ANPS for consultation by summer 2026, together with supporting assessments.