Reserved Matters Remain Anchored to the Identified Outline Permission: “As Varied by” a Section 73 Permission Does Not Switch the Parent Consent
1. Introduction
Wildfish, R (On the Application Of) v Buckinghamshire Council & Ors concerned a challenge to Buckinghamshire Council’s approval of reserved matters for a large housing scheme at Land Off Walnut Drive and Foscote Road, Maids Moreton. The developer (the second respondent) held an outline planning permission (16/00151/AOP) with reserved matters required for appearance, landscaping, layout and scale. The flashpoint was a drainage-related condition (condition 13) which, in its original form, required submission of a foul drainage scheme including a wastewater treatment capacity assessment and an upgrade programme.
After Anglian Water indicated uncertainty about committed capacity upgrades at Buckingham WRC, the developer obtained a section 73 permission varying condition 13 so that upgrade completion was controlled prior to occupation rather than requiring the earlier submission of the upgrade programme with the reserved matters material. The Council then granted reserved matters approval on 4 March 2025, describing the reserved matters as being sought under the outline approval “as varied by” the section 73 permission.
The appellant argued (i) that condition 13 was temporally tied to the reserved matters and their time limit, making the reserved matters approval unlawful, and (ii) that the Council had unlawfully “switched” the reserved matters to the section 73 permission when the time for reserved matters under that new permission had expired. Lang J dismissed the judicial review; the Court of Appeal dismissed the appeal.
2. Summary of the Judgment
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The Court held that drainage is not a “reserved matter” within the statutory scheme for outline permissions; therefore, the time limit for reserved matters submission did not govern the provision of all material relevant to condition 13.
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The Court construed the outline permission objectively: the reference in condition 13 to details “submitted… in accordance with condition (1)” was a cross-reference ensuring the reserved matters design took account of on-site foul drainage, not a mechanism converting the off-site WRC upgrade programme into a reserved matter subject to the reserved matters deadline.
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The change to the reserved matters description to add “as varied by” the section 73 permission did not amount to a substantial amendment, nor did it transfer the reserved matters application to the section 73 permission. The reserved matters approval remained an approval under the original outline permission.
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The Court expressly left open (because it did not arise on the facts as properly construed) the broader issue of whether reserved matters submitted in time under an original outline permission could be approved “with reference to” a later section 73 permission after the later permission’s reserved matters submission window would have expired.
3. Analysis
3.1 Precedents Cited
Powergen UK plc v Leicester City Council [2001] 81 P&CR 5 (approving Pye v Secretary of State for the Environment [1998] 3 PLR 72)
The Court set out the orthodox understanding of section 73 permissions: a section 73 grant leaves the original permission intact and creates an additional, independent permission, allowing the developer to choose which to implement. The Court relied on the cited passages principally to reinforce two interpretive points:
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First, that describing a section 73 outcome as a “variation” is common but potentially misleading: legally it is a new permission (a theme later crystallised by the Supreme Court in Lambeth).
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Second, Schiemann LJ’s observation (quoted from Powergen UK plc v Leicester City Council [2001] 81 P&CR 5) that where an alteration does not require changing previously approved details, authorities can sensibly refer to existing material without being drawn into reconsidering merits beyond the confines of section 73.
In Wildfish, the Council’s reserved matters approval merely acknowledged the existence of the section 73 permission; it did not purport to re-approve or re-run the reserved matters under a different parent consent.
Lambeth LBC v Secretary of State for Housing, Community and Government [2019] UKSC 33, [2019] 1 WLR 4317
Lambeth LBC v Secretary of State for Housing, Community and Government [2019] UKSC 33, [2019] 1 WLR 4317 was cited for the proposition that “variation” language is legally inaccurate: a section 73 permission takes effect as an independent permission for the same development, but subject to the amended conditions. This mattered in Wildfish because the appellant sought to treat “as varied by” as effecting a switch of parent permission. The Court rejected that: a mere reference to the existence of the new permission could not, without clear legal steps, convert the reserved matters approval into one made under the section 73 permission.
Trump International Golf Club Scotland Limited v Scottish Ministers [2015] UKSC 74, [2016] 1 WLR 85 and DB Symmetry v Swindon BC [2022] UKSC 33, [2023] 1 WLR 198
These authorities anchored the Court’s approach to construing public planning documents: the question is what a reasonable reader, equipped with some planning knowledge, would understand from the words used in their context, applying ordinary meaning and common sense, and with restraint in implying terms.
The Court applied this directly to:
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the meaning and function of the cross-reference in condition 13 to condition 1; and
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the effect of the reserved matters decision notice’s wording “as varied by” and its informative, concluding the reserved matters were approved under the outline permission notwithstanding the factual existence of the section 73 permission.
These cases supplied the framework for when and how planning applications (including reserved matters applications) may be amended despite the absence of an express statutory amendment power. They establish that amendments are permissible unless they change the whole character of the application so as to amount to a new one.
The Court used this line of authority to conclude that adding “as varied by” to the description did not change the application’s substance—particularly given the Court’s earlier finding that condition 13 discharge was not, in reality, being sought through the reserved matters application (unlike conditions 22 and 8, which were explicitly included).
R (Murray) v Hampshire County Council [2003] JPL 224
R (Murray) v Hampshire County Council [2003] JPL 224 was central to ground one. The Court relied on it for two linked propositions:
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Drainage details are not “reserved matters” under the statutory definition; and
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Such details are commonly controlled by conditions requiring approval before commencement, rather than by the statutory reserved matters submission timetable.
This authority reinforced the Court’s rejection of the appellant’s attempt to treat condition 13’s requirements (including off-site WRC upgrade programming) as necessarily locked into the reserved matters time limit.
3.2 Legal Reasoning
(a) Statutory architecture: what can be “reserved matters”
The Court began with the statutory definition (2015 Order): reserved matters are limited to access, appearance, landscaping, layout and scale. Because drainage is not included, it cannot be transformed into a reserved matter merely because condition 13 cross-referred to condition 1.
(b) Objective interpretation of the outline permission’s conditions
The appellant’s case depended on reading the words in condition 13 (“details… submitted… in accordance with condition (1)”) as importing the condition 2 reserved matters deadline. The Court rejected this on an objective, whole-permission reading:
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Condition 13’s cross-reference to condition 1 was understood as a practical drafting device: the reserved matters design must incorporate on-site foul drainage arrangements (which were indeed shown on the approved plans).
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The off-site WRC upgrade issue was addressed by the “no occupation” control (and, in the section 73 version, by the revised timing), not by the reserved matters submission timetable.
(c) The “Conditions Compliance Table” could not rewrite the permission
The Court treated the Conditions Compliance Table as an internal checklist and, critically, extrinsic to the public documents being construed. Even if consulted, it concerned on-site foul drainage, not discharge of the whole of condition 13. It therefore could not support the argument that the reserved matters application necessarily encompassed the off-site upgrade programme.
(d) “As varied by” did not change the parent permission for reserved matters
The Court treated the reserved matters decision notice as determinative: it was headed with the reserved matters application reference and remained anchored to the outline permission. The words “as varied by” were construed as a factual acknowledgement that there existed a section 73 permission varying condition 13, not as a legal switch of the parent consent.
The Court also rejected an alternative argument that the reserved matters were approved under both permissions. Such a construction would generate practical uncertainty (e.g., which condition 13 regime applied on implementation), and would conflict with the 2015 Order’s requirement (article 6(a)) that an application must provide sufficient information to identify the outline permission in respect of which it is made.
(e) A consciously limited ratio on the section 73/timing point
Because the Court concluded the reserved matters approval was under the original outline permission, it did not need to resolve the broader contention about whether reserved matters submitted under one outline consent could be approved “with reference to” a later section 73 permission outside that later permission’s reserved matters submission period. The Court preferred to leave that question for a case where the issue truly arises on the facts.
3.3 Impact
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Clarity on drafting cross-references: Conditions that require certain details “in accordance with” a reserved matters condition will not, without more, convert non-reserved matters (e.g., drainage) into reserved matters or import the reserved matters submission timetable.
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Limits of “as varied by” language: Planning authorities and developers frequently use shorthand wording on decision notices. This case cautions that such wording will be read as a narrative reference unless it clearly and lawfully identifies a different parent permission for the reserved matters approval.
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Reduced risk of technical knockouts: The Court’s approach discourages overly technical challenges that attempt to invalidate reserved matters approvals on the basis of condition phrasing where the statutory reserved matters taxonomy does not support the challenge.
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Open issue preserved: Practitioners should note the unresolved question about the interaction between reserved matters submitted under an original outline permission and later section 73 permissions where timing under the later permission is in play. The Court of Appeal did not decide it here.
4. Complex Concepts Simplified
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Outline planning permission: Permission that approves development in principle, leaving specified “reserved matters” (like appearance/layout) for later approval.
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Reserved matters: A closed list (access, appearance, landscaping, layout, scale). If something is not on the list (e.g., drainage), it is not a reserved matter even if dealt with by condition.
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Section 73 permission: A mechanism to obtain a new permission for the same development but with different conditions. It does not “edit” the original permission; it sits alongside it as an alternative consent.
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Discharge of conditions vs reserved matters approval: Reserved matters approval fills in missing design parameters required by the outline permission. “Discharging” a condition is satisfying a separate requirement imposed by condition (which may occur before commencement or before occupation, depending on the condition).
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Reasonable reader test: Planning permissions are public documents. Courts interpret them by asking what a reasonable reader, with some planning knowledge, would understand from the text in context—rather than what the parties intended privately.
5. Conclusion
The Court of Appeal confirmed that (i) non-reserved matters (here, drainage) cannot be forced into the reserved matters regime by condition cross-referencing, and (ii) adding “as varied by” a section 73 permission to a reserved matters description does not, without clear legal effect, transfer or duplicate the reserved matters approval under a different parent permission. The case underscores disciplined, objective construction of planning documents and protects reserved matters approvals from being undermined by mischaracterisations of what the statutory reserved matters process can require.