Howsmoor Developments Ltd & Ors, R (on the application of) v South Gloucestershire Council

A planning authority’s interpretation of a development plan is normally reviewable only on public-law grounds. Where the interpretation falls within the range of reasonable interpretations, the court will intervene only if it is perverse. Development plans must be read as a whole. A supplementary planning document may provide an indicative framework for implementing an allocation already made by the development plan without making a further site-specific allocation.

Strategic environmental assessment is also shaped by the plan’s content, level of detail and stage in the decision-making process. Where an earlier lawful plan has established the strategic allocation, a later development brief need assess the environmental effects of taking that allocation forward at its own level of detail. It need not reassess the underlying allocation or matters appropriately left for later planning applications.

South Gloucestershire Council adopted the Emersons Green East Development Brief for a 177-hectare mixed-use urban extension. The Claimants, who owned substantial land within the site, sought judicial review and an order quashing the decision.

The Claimants argued that the Brief unlawfully allocated a multi-modal interchange and pedestrian bridge, contrary to Regulation 7 of the Local Development Regulations. They also alleged failures under the strategic environmental assessment regime, including the requirements of Regulations 8 and 12 of the SEA Regulations and Article 5 of Directive 2001-42-EC.

The central issues were whether the Local Plan had already allocated the interchange and bridge to Emersons Green East, and whether the sustainability appraisal accompanying the Brief adequately assessed the environmental effects at that stage of the planning process.

1. Outcome. Permission to apply for judicial review was granted, but the claim was dismissed.
2. Interpretation of the development plan. The court applied the principle stated in R v Derbyshire County Council ex parte Woods [1997] JPL 998: unless the Council’s interpretation was perverse, it could not be successfully challenged. The development plan had to be read as a whole.
3. The Structure Plan and Local Plan, including Figure 6.3, Policy M2 and its supporting text, established that the multi-modal interchange and pedestrian bridge were to be located within Emersons Green East. The fact that detailed sites remained to be investigated did not remove that allocation. The Council was therefore entitled to include the interchange and bridge in the Brief.
4. The Brief provided an indicative framework for carrying forward the Local Plan allocation. It did not make a further site-specific allocation within Emersons Green East. The challenge under Regulation 7 of the Local Development Regulations therefore failed.
5. Strategic environmental assessment. Article 5(2) of Directive 2001-42-EC required the information in the environmental report to reflect the contents and level of detail of the plan, its stage in the decision-making process and the need to avoid duplication. Article 13 did not require policies developed before the Directive’s effective date to be reassessed retrospectively.
6. The sustainability appraisal appropriately assessed the environmental effects of taking forward the Policy M2 allocation through indicative proposals. It was not required to reassess the rationale for the development, the overall mix of uses, the infrastructure requirements already established by the Local Plan, or a particular site allocation. Detailed proposals and mitigation could be assessed at the planning application stage. There was no breach of the Directive or paragraph 4.1.6 of the government guidance. The Regulation 12(2) argument did not arise.