Question to the Department for Transport:

To ask the Secretary of State for Transport, what metrics will be included in the four tests on Heathrow expansion and how these will be applied to the proposal.

As part of the review of the Airports National Policy Statement (ANPS) the government will consider how any proposed scheme for Heathrow Expansion will meet the four clear tests on economic growth, climate, air quality, and noise and whether any metrics are needed to measure if these tests are being met.

To do this, during the review of the ANPS the Government will analyse the economic and environmental impacts of expansion at Heathrow, which will inform whether amendments are needed to the ANPS to meet the four tests. We expect any draft amendments to the ANPS will be ready for consultation by summer 2026.

It will be for promoters to apply for a development consent order. Applications for development consent will be examined by the Planning Inspectorate, and the Secretary of State for Transport will make a decision in line with the ANPS on whether to grant a development consent order.