R (Luton and District Association for the Control of Aircraft Noise) v Secretary of State for Transport [2025] EWHC 3206 (Admin)
Luton Aircraft Noise is an important Planning Court decision on the limits and application of Finch in environmental impact assessment.
The challenge concerned the Development Consent Order allowing London Luton Airport to expand from 19 million to 32 million passengers a year. Mrs Justice Lang dismissed grounds 1 to 5 of the judicial review. A sixth ground concerning the Jet Zero Strategy had been stayed and was not decided in this judgment.
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- Neutral citation
- [2025] EWHC 3206 (Admin)
- Court
- High Court, Planning Court
- Judgment date
- 8th December 2025
- Judge
- Mrs Justice Lang DBE
- Case number
- AC-2025-LON-001560
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Finch does not require assessment of every conceivable indirect effect
The court rejected the argument that Finch requires every indirect climate effect to be quantified and assessed regardless of the available evidence or methodology.
Lang J emphasised Lord Leggatt’s statement in Finch that only effects which evidence shows are likely to occur and which are capable of meaningful assessment must be assessed. That principle applies not only to identifying causation but also to the nature and extent of the assessment of significance.
Inbound flight emissions were effects of the project
Unlike Finch, there was no dispute that emissions from inbound flights were effects of the airport expansion. They had also been quantified in supplementary environmental information after the Supreme Court judgment.
The difficulty was how to assess their significance against recognised UK benchmarks, because the national carbon budgets, Jet Zero Strategy and other established comparators account for outbound international aviation rather than both legs of a journey.
The Secretary of State was entitled to conclude that a quantitative significance assessment against those benchmarks would not compare like with like. The choice and use of an appropriate benchmark was an evaluative judgment subject to ordinary public-law review.
EIA is a process, not just the original environmental statement
The inbound emissions had not been assessed in the original environmental statement in the form later provided. But supplementary information was subsequently produced, publicised and consulted upon.
The court reaffirmed that EIA is an ongoing process. The relevant environmental information includes later information and representations, not merely the first environmental statement submitted with the application.
A qualitative assessment of non-CO2 aviation effects was lawful
The challenge also concerned non-CO2 warming effects such as contrails. The court accepted that those effects were real and were not ignored.
However, there remained significant scientific uncertainty over how to quantify them and no accepted benchmark against which to contextualise them. The Examining Authority and Secretary of State were entitled to accept a qualitative, high-level assessment. There was no legal rule requiring a numerical multiplier simply because one could theoretically be applied.
The Gatwick Examining Authority report was not a mandatory consideration
The claimant argued that the Secretary of State had to take account of the treatment of inbound emissions in the Gatwick Airport examination.
The court rejected that ground. The Gatwick Examining Authority’s views were recommendations in a different examination for a different project, not a decision establishing a consistency principle. They were not so obviously material that failing to consider them was irrational.
The Climate Change Act regime could be relied upon
The court also upheld the Secretary of State’s reliance on the wider statutory and regulatory regime for controlling aviation greenhouse-gas emissions. The long-established principle allowing planning decision-makers to have regard to and rely upon controls outside the planning system was not displaced by Finch.
The CROW Act reasons were adequate
The final ground concerned the strengthened duty to seek to further the conservation and enhancement of the Chilterns National Landscape. The Secretary of State had secured a £250,000 contribution for enhancement projects.
The court held that the reasons were adequate and intelligible. The Secretary of State had addressed the statutory duty, the competing evidence and the scale of the impacts, and was not required to give reasons for every step of her reasoning.
Why Luton matters after Finch
The judgment is an important companion to Finch. Finch establishes that likely significant indirect effects cannot be excluded merely because they occur downstream or elsewhere. Luton shows the other side of the test: the EIA regime still involves evaluative judgment about likelihood, significance, available evidence and whether an effect is capable of meaningful assessment.
Read the full Luton judgment
Planning Geek holds the approved Planning Court judgment in the protected case law library. Gold Members can open the PDF below.
Luton Airport Case Law Page Updated: 11th September 2026