Supreme Court clarifies limits of planning policy in environmental protection: C G Fry & Son Limited v Secretary of State for Housing, Communities and Local Government [2025] UKSC 35
On 22nd October 2025, The Supreme Court handed down a significant judgment in C G Fry & Son Limited v Secretary of State for Housing, Communities and Local Government [2025] UKSC 35, clarifying the interaction between national planning policy, environmental protection, and the legal effect of planning permissions.
Although the Court maintained previous interpretations of the Conservation of Habitats and Species Regulations 2017 (‘the Habitats Regulations’), it made a distinction between legally obligatory requirements and planning policy. Even when environmental protection goals are being pursued, the ruling affirms that national policy cannot retroactively restrict or supersede the legal rights conferred by a planning permission.
Case background
The outline planning permission for a large residential and mixed-use project at Jurston Farm, close to Wellington, Somerset, was granted to C G Fry & Son Limited by Somerset West and Taunton Council (now Somerset Council) in December 2015. This location is in the River Tone’s catchment, which supplies water to the Somerset Levels and Moors Ramsar site, a wetland protected internationally by the Ramsar Convention.
The development, which includes up to 650 homes, a school, and community infrastructure projects, was proposed to be built in 8 phases and was subject to 19 planning conditions being met. In June 2020, the Council approved matters for Phase 3, which was to cover 190 homes, and had attached several sub-conditions, such as the requirements for drainage, tree protection, and environmental management.
Shortly after, in August 2020, Natural England released fresh scientific guidance alerting people to the danger of eutrophication in the Somerset Levels due to phosphate pollution from development. It recommended that in order to prove ‘nutrient neutrality’, any development that is likely to raise phosphate burdens should go through a Habitats Regulations Assessment.
When the developer later applied to discharge the Phase 3 sub-conditions in June 2021, the Council refused, relying on paragraph 181 of the National Planning Policy Framework (NPPF), which provides that Ramsar sites should receive the same level of protection as European sites, and on Natural England’s 2020 advice.
C G Fry argued that Ramsar sites were exempt from the Habitats Regulations and that discharge of criteria previously associated with a license did not require an assessment. C G Fry appealed under sections 78 and 288 of the Town and County Planning Act 1990 (‘TCPA’) to challenge the planning inspector’s decision on the basis that it involved an error of law in interpreting and applying the Habitats Regulations and NPPF.
Procedural history
Under section 78 TCPA, the developer appealed the Council’s lack of determination to the Secretary of State. A planning inspector rejected the appeal, concluding that before the sub-conditions could be released, a suitable evaluation of the NPPF and the precautionary approach was necessary.
The developer’s challenge under section 288 TCPA was dismissed by Sir Ross Cranston in the High Court ([2023] EWHC 1622 (Admin)), who held that the precautionary principle justified applying the Habitats Regulations to later stages of planning control.
The Court of Appeal ([2024] EWCA Civ 730) upheld the High Court’s decision, ruling that:
- Regulation 63 of the Habitats Regulations extends to the discharge of reserved matters conditions; and
- Paragraph 181 of the NPPF was a material consideration that properly guided the Council’s refusal.
C G Fry appealed to the Supreme Court, arguing that (1) the Habitats Regulations did not require an assessment at the condition-discharge stage, and (2) national policy could not lawfully expand the scope of those Regulations to Ramsar sites.
Issue 1: Appropriate assessments under the habitats regulations
The first issue before the Court concerned the scope of regulation 63 of the Habitats Regulations, which requires a ‘competent authority’ to undertake an appropriate assessment before granting any consent for a plan or project that could have a significant effect on a protected site.
C G Fry argued that this duty arises only at the initial grant of planning permission and does not extend to later stages such as the approval of reserved matters or the discharge of conditions. In their view, once permission is issued, the principle of the development is settled and cannot be revisited through subsequent environmental assessments.
However, Lord Sales rejected this interpretation, agreeing with the Court of Appeal’s purposive approach [paragraph 46]. He held that the language and purpose of regulation 63 demonstrates a broader scope, ensuring ongoing protection for sensitive sites throughout the planning process. The Court held that:
- Regulation 63 uses wide and unqualified terms, applying before ‘any consent, permission or other authorisation’ is granted [paragraphs 54–55]
- The Regulations must be read with consideration of their environmental protection objective and the precautionary principle, which underpin both the Habitats Directive and domestic law [paragraph 56]
- It would defeat those objectives to prevent assessments at later stages, particularly where new scientific information emerges after permission has been granted [paragraph 57]
The Court therefore confirmed that an appropriate assessment may be required at any stage where new evidence suggests a potential risk to a protected site.
Issue 2: The effect of national policy and Ramsar protection
The second issue dealt with the legal effect of planning permission and the relationship between statutory planning rights and national planning policy, particularly in the context of Ramsar sites. Unlike European sites protected under the Habitats Regulations, Ramsar sites rely on policy-based protection rather than statutory law. Paragraph 181 of the NPPF provides that Ramsar sites ‘should be given the same protection’ as European sites.
Relying on that provision, the Council and the planning inspector had concluded that an appropriate assessment was required before discharging conditions for Phase 3 of the development. Before the Supreme Court, C G Fry argued that this approach misstated the legal effect of a planning permission. Once permission is granted, it creates a legal right to develop the land subject only to the conditions expressly attached. National policy, however strongly worded, cannot alter or curtail those statutory rights.
Lord Sales agreed. In paragraphs 60 – 70 of the judgment, he explained that both full and outline permissions confer rights defined by the terms of the grant. Those rights cannot be diluted, overridden, or revisited by general government policy or subsequent scientific advice. The scope of an authority’s control is determined by the conditions within the permission itself; it cannot withhold approval to further a policy objective that lies outside those conditions.
The Court held that in this case, the Council and the inspector went beyond their lawful powers by relying on paragraph 181 of the NPPF and Natural England’s 2020 advice to reconsider phosphate impacts already accepted at the stage. Lord Sales described this as effectively using policy to reopen matters of principle that had already been settled, contrary to the structure of TCPA. He observed that the conditions in the permission ‘allowed no reference to the objective of protecting the Ramsar site’ and therefore could not serve as a lawful basis for refusing to discharge the sub-conditions [paragraphs 69 – 70].
Accordingly, while national policy is a material consideration when granting planning permission, it cannot retrospectively affect permissions already issued. The Supreme Court, therefore, allowed the appeal on this second ground.
Implications from the decision
The decision carries significance on two fronts.
Firstly, it reaffirms the broad and precautionary reach of the Habitats Regulations for developments that may affect European sites. The judgment confirms that an appropriate assessment can be required not only at the point of granting planning permission, but also at later stages of the process where new risks or information come to fruition. This interpretation ensures that environmental protection remains a continuing obligation rather than a one-off exercise. Local authorities may therefore need to revisit environmental assessments when updated scientific evidence indicates a potential impact on protected habitats, even after consent is granted.
Secondly, and more importantly for developers and landowners, the ruling strongly reinforces the legal certainty of planning permissions. Once permission is lawfully granted, it creates a defined statutory right to develop in accordance with its terms. That right cannot retrospectively be restricted by subsequent changes in national policy or evolving environmental guidance, however well-intentioned. Lord Sales’ reasoning underscores that policy is not law and cannot alter or dilute the legal effect of a planning permission.
For local planning authorities, the judgment delivers a clear message that policy objectives cannot substitute for statutory powers. Where government wishes to extend the level of protection afforded by the Habitats Regulations to Ramsar sites, it must do so through legislative amendment, not through the reinterpretation of planning guidance or the NPPF.
The forthcoming Planning and Infrastructure Bill may alter how these issues are approached. The Bill proposes a new framework for delivering environmental outcomes through Environmental Delivery Plans and a Nature Restoration Fund, aiming to create a more strategic, catchment-level system for managing impacts on sensitive habitats. While the detail is still under consultation, analysts have noted that these reforms could shift the emphasis away from the project-by-project assessments required under the current Habitats Regulations regime.
Until any legislative change takes effect, however, the principles confirmed in this judgment (particularly the limits of policy and the legal certainty of planning permissions) remain the governing position in law.
