Strict enforcement of the 7‑day Court of Appeal appeal deadline in NSIP DCO judicial reviews under PD 52D para 17.3

Case: Luton And District Association for the Control of Aircraft Noise, R (On the Application Of) v London Luton Airport Ltd [2026] EWCA Civ 648
Court: Court of Appeal (Civil Division) (Bean LJ (VP), Lewison LJ, Holgate LJ)
Date: 21 May 2026
Subject: Extension of time to apply for permission to appeal in a Planning Act 2008 s.118 DCO challenge; effect of PD 52D para 17.3 “target” appeal timetable.

1. Introduction

This decision concerns the procedural discipline expected in appeals arising from judicial reviews of Development Consent Orders (“DCOs”) for nationally significant infrastructure projects (“NSIPs”). The appellant (a local association concerned with aircraft noise) sought an extension of time to file an appellant’s notice and pursue permission to appeal against a Planning Court judgment (Lang J) that had dismissed its challenge to a DCO made by the Secretary of State for Transport under the Planning Act 2008.

The key issue was not the substantive legality of the DCO, but whether the Court of Appeal should extend time where the appellant missed the newly-shortened 7-day deadline for filing an appellant’s notice in these cases under PD 52D para 17.3(2)(a).

2. Summary of the Judgment

The Court of Appeal refused an extension of time. As a result, the application for permission to appeal also failed.

Applying R (Hysaj) v SSHD [2014] EWCA Civ 1633 and the Denton v TH White Ltd [2014] EWCA Civ 906 three-stage approach (seriousness/significance; reasons; all the circumstances), the court held:

  • the breach was serious and significant (more than double the time permitted, and the extension application itself was late);
  • there was no good reason (overlooking/ignorance of the deadline—particularly by a specialist team—does not suffice);
  • at stage three, the structural policy of expedition in NSIP litigation, reflected in the Planning Act 2008 and post-Banner reforms, meant compliance carried particular weight and the extension would undermine the regime’s “target” timetable.

3. Analysis

3.1 The statutory and procedural setting: speeding up NSIP litigation

The court situated the decision within the purpose of the Planning Act 2008: to avoid “interminable” planning processes and accelerate delivery of NSIPs through nationally set policy and a streamlined examination process. That context matters because time limits and accelerated procedures are not incidental; they are integral to the legislative design.

The judgment noted:

  • Planning Act 2008 s.118(1) imposes a strict 6-week window to bring a DCO judicial review (a statutory limit the courts cannot extend).
  • CPR 52.12 and PD 52D para 17.3 now impose a 7-day deadline for filing an appellant’s notice in these appeals, linked to “target timescales” (4 weeks for permission; 4 months to hearing if permission granted).
  • These changes followed Lord Banner KC’s review aimed at reducing delay from unsuccessful challenges while respecting constitutional principles and the Aarhus Convention.

3.2 Precedents cited and how they shaped the outcome

(a) R (Hysaj) v SSHD [2014] EWCA Civ 1633

Hysaj provided the governing approach: extension of time to appeal is decided on the same principles as relief from sanctions, using the Denton framework. It also supplied two key discipline points applied here:

  • Overlooking/ignorance of deadlines is not a good reason (especially where lawyers practise in the area).
  • Merits are usually irrelevant unless obviously very strong or very weak; courts should avoid mini-trials on merits at the extension stage.

(b) Denton v TH White Ltd [2014] EWCA Civ 906

Denton structured the analysis into three stages. The court’s key move was to treat the breach’s seriousness/significance as relative to the specific regime: a 9-day late filing is not assessed against a generic notion of delay, but against a deliberately compressed 7-day timetable designed to meet fixed targets.

(c) NSIP framework cases: R (Spurrier) v Secretary of State for Transport [2019] EWHC 1070 (Admin) and R (Friends of the Earth) v Secretary of State for Transport [2020] UKSC 52

These were cited for the background and structure of the Planning Act 2008 regime—policy-frontloading, streamlined examination, and the intended pace of decision-making. They reinforced the idea that expedition is a defining feature of NSIP planning and litigation.

(d) Public law delay and administration: R (Good Law Project Ltd) v Secretary of State for Health and Social Care [2022] EWCA Civ 355

Good Law supported two propositions deployed at stage three:

  • delay is detrimental to good administration and the public interest;
  • a public interest issue is not, by itself, a “compelling reason” to excuse non-compliance (the judgment cited Good Law at [70] on the “public interest factor”).

3.3 The court’s legal reasoning (why the extension was refused)

Stage 1: seriousness and significance

The appellant’s notice was filed well outside the 7-day limit, and the extension application came nearly six weeks after expiry. Critically, the court assessed seriousness against the PD 52D para 17.3 design: the breach made it impossible to meet the target dates for permission and (if granted) for a substantive appeal.

Stage 2: reasons for default

The court rejected the attempt to justify default by saying Lord Banner’s report did not explicitly recommend cutting the appeal filing period. The court treated the “knock-on” possibility as something specialist practitioners should have anticipated and checked—particularly given the lead-in period before the October 2025 change and the further time before judgment was handed down.

Stage 3: all the circumstances (with particular weight on efficiency and compliance)

The court engaged directly with four main arguments advanced for an extension:

  • No delay to the development: rejected. Even if ground works were unaffected, uncertainty and delay affected “orderly progress” (e.g., governance structures, monitoring, and project planning), and the regime’s purpose is to reduce such delay and uncertainty.
  • Only 9 days late / within a “normal” 21-day mindset: rejected. The relevant limit was 7 days; plus the delay forced a rolled-up hearing, increasing costs and compromising the regime’s target timetable—analogous to losing a trial date.
  • Public importance: acknowledged but treated as inherent in most NSIP cases and not decisive; similar issues can be litigated in other timely challenges.
  • Strength of grounds: not a basis to extend time unless obviously compelling without detailed investigation. The court was not persuaded there was an obvious flaw in Lang J’s reasoning, and considered the merits “far from sufficiently clear” to affect the stage-three balance.

The court placed special emphasis on the structural nature of the reforms: PD 52D para 17.3 imposes targets on the court itself, reflecting a policy choice to accelerate finality. In this category of litigation, the need to enforce compliance with rules and practice directions carried “particular weight”, and the court stated it must “send out a clear message” that delay in NSIP appeals is unacceptable.

3.4 Impact and significance

  • Hard-edged approach to PD 52D para 17.3: although framed in “target timescales”, the court treated the timetable as a central feature of the NSIP regime. Missing the 7-day deadline will be difficult to cure absent truly exceptional circumstances.
  • Merits rarely rescue delay: even in high-profile public law litigation, the court will not routinely examine merits at length to justify an extension.
  • Investor and stakeholder confidence rationale is judicially endorsed: the court accepted that predictability and finality are systemic goods in NSIP delivery, not merely case-specific concerns.
  • Practical message for practitioners: specialist teams are expected to track and implement procedural reforms; “I assumed the old time limit” is unlikely to succeed.

4. Complex concepts simplified

  • DCO (Development Consent Order): a statutory consent under the Planning Act 2008 allowing construction/operation of major infrastructure, replacing multiple separate consents.
  • NSIP: a project of national significance (e.g., large airports, roads, energy infrastructure) subject to the Planning Act 2008 fast-track regime.
  • Section 118 challenge: a specialised judicial review route with strict time limits to challenge a DCO.
  • PD 52D para 17.3: a Practice Direction setting accelerated timescales for appeals in NSIP cases, including a 7-day deadline for filing an appellant’s notice.
  • Relief from sanctions / Denton test: a structured method for deciding whether to excuse procedural default—focusing on seriousness, reasons, and overall justice with emphasis on efficiency and compliance.
  • Rolled-up hearing: a hearing dealing with multiple steps together (here, extension of time and permission/appeal preparation), sometimes used to limit further delay but potentially increasing costs for respondents.

5. Conclusion

Luton And District Association for the Control of Aircraft Noise, R (On the Application Of) v London Luton Airport Ltd [2026] EWCA Civ 648 confirms that, in NSIP DCO litigation, the Court of Appeal will apply Hysaj/Denton with particular rigour to uphold the accelerated appellate timetable in PD 52D para 17.3. Public interest and arguable grounds will not ordinarily outweigh serious, unexplained non-compliance—especially where delay undermines the regime’s structural commitment to speed, predictability, and finality in nationally significant infrastructure delivery.