## Facts

- The case concerned the UK government’s ratification of the Maastricht Treaty, which established the European Union and had significant constitutional implications.
- Lord Rees-Mogg, a former editor and outspoken critic regarding European unification, initiated a legal challenge against the Foreign Secretary’s decision to ratify the treaty.
- Rees-Mogg’s challenge questioned the impact of the treaty on British sovereignty and constitutional arrangements.
- The Foreign Secretary contended that Rees-Mogg lacked sufficient interest (standing) to bring the judicial review claim.
- The case provided an opportunity for the court to examine and clarify the requirements for standing—_locus standi_—within the context of constitutional claims.

## Issues

1. Whether Lord Rees-Mogg had sufficient interest (standing) to bring a judicial review regarding the government’s ratification of the Maastricht Treaty.
2. Whether a demonstrable interest in constitutional affairs, rather than a direct personal or material stake, could suffice for standing in challenges with major constitutional significance.
3. Whether the "sufficient interest" test should be applied more flexibly in cases raising important constitutional issues.

## Decision

- The Divisional Court held that Rees-Mogg had standing due to his sincere and demonstrable interest in constitutional affairs.
- The court found that, while _locus standi_ serves as a barrier to frivolous litigation, its application is flexible, especially in constitutional contexts.
- It was recognized that an individual may have sufficient standing to challenge a governmental action with serious constitutional implications, even without a direct personal or financial interest.
- The claim was permitted to proceed, confirming that engagement with constitutional questions could satisfy the sufficient interest requirement.

## Legal Principles

- The principle of _locus standi_ ensures that only those with a sufficient interest can bring judicial review proceedings.
- The test for "sufficient interest" in standing is context-dependent and may be interpreted more liberally in cases with constitutional significance.
- A demonstrable and genuine commitment to constitutional affairs can, in certain cases, meet the threshold for standing—even where no direct personal or financial interest exists.
- The case reflects a broader judicial trend towards a more liberal approach in granting standing for public interest and constitutional challenges.

## Conclusion

The judgment in R v Secretary of State for Foreign and Commonwealth Affairs, ex parte Rees-Mogg clarified that a sincere and demonstrable interest in constitutional matters can provide sufficient standing for judicial review, shaping a more flexible and inclusive interpretation of _locus standi_ in constitutional cases.

R v Secretary of State for Foreign and Commonwealth Affairs, ex parte Rees-Mogg [1994] QB 552