Imperative Reasons of Overriding Public Interest IROPI

The phrase Imperative Reasons of Overriding Public Interest (IROPI) originates from Article 6(4) of the EU Habitats Directive (92/43/EEC), which was adopted on 21 May, 1992. The UK continues to use the phrase since leaving the EU, commonly in reference to the Conservation of Habitats and Species Regulations 2017, which transposed the land and marine aspects of the EU Habitats Directive and certain elements of the Wild Birds Directive into domestic law.

The phrase means to allow exception to a certain nature protection regulation if particular conditions are met, which is normally established by a four stage process, from initial screening to assessing for IROPI:

• Stage 1: Screening determines if the plan or project is likely to have significant effects on a site.
• Stage 2: Appropriate detail assessment of potential impacts, identifying ways to avoid or minimise them.
• Stage 3: Assessment of alternative solutions to achieve the project's objectives reducing adverse impacts.
• Stage 4: Where no feasible alternatives exist, assessment is made see if there are "imperative reasons of overriding public interest" that justify the project, even with its adverse impacts.

The phrase is also mentioned in relation to the Defra Infrastructure Board established to unblock barriers to development at an early stage and accelerate the delivery of major infrastructure projects in the UK by facilitating greater collaboration and stronger oversight within Defra and its arm’s-length bodies. It was the third recommendation of the corporate report An independent review of Defra’s regulatory landscape, which was published 2 April 2025.

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