Factual and Procedural Background
The appeal concerns a 29-acre housing development site (“The Site”) located within The National Park. In 1967 the local planning authority (“Respondent”) granted full planning permission for 401 dwellings laid out in accordance with a detailed “Master Plan” (“the 1967 permission”). Development progressed extremely slowly: by 1987 only 19 houses had been built, none in accordance with the Master Plan. During that period and afterwards, the landowner (“Appellant”) obtained a series of additional, site-specific planning permissions authorising development that diverged from the Master Plan.
Litigation in 1985–87 culminated in a High Court declaration by Judge [Drake] that the 1967 permission had been lawfully implemented and could be completed in future. After 1987 the Appellant obtained eight more permissions (labelled A–H) and undertook further construction that materially conflicted with the Master Plan, including roads and dwellings placed across routes and plots shown on that plan.
In 2017 the Respondent asserted that it was now impossible to implement the 1967 permission and required works to cease. The Appellant sought declaratory relief. Judge [Keyser] (High Court) dismissed the claim; the Court of Appeal (per Judge [Singh] LJ) upheld that decision. The Supreme Court, constituted by Judge [Sales], Judge [Leggatt], Judge [Reed], Judge [Briggs] and Judge [Rose], granted permission to appeal solely on the viability of further development under the 1967 permission.
Legal Issues Presented
- Does the 1967 permission continue to authorise further development on parts of The Site notwithstanding later, inconsistent permissions and works?
- Are the post-1987 permissions true “variations” of the 1967 permission (thereby modifying rather than supplanting it) or independent permissions confined to their specific plots?
- Can a multi-unit permission such as the 1967 permission be severed so that individual elements survive even when the overall scheme becomes impossible to complete?
Arguments of the Parties
Appellant's Arguments
- Abandonment analysis: The Pilkington doctrine should be viewed as a form of abandonment; the Appellant’s conduct would not lead a reasonable observer to conclude that the 1967 permission was abandoned.
- Severability: A multi-unit permission implicitly authorises construction of any sub-set of approved buildings; therefore undisturbed parts of The Site can still be developed under the 1967 permission.
- Variation theory: Each post-1987 permission, many expressly labelled a “variation,” should be construed as locally modifying (not superseding) the Master Plan, leaving the remainder of the 1967 permission intact.
Respondent's Arguments
- The 1967 permission is a single, integrated scheme; material departures undertaken under later permissions render full compliance physically impossible, so no further works can lawfully rely on it.
- No statutory power permits material variation of an existing permission; consequently, post-1987 permissions are stand-alone consents confined to their defined plots.
- The Pilkington principle, not abandonment, governs: once implementation of another permission makes the original scheme impossible, the original permission ceases to authorise further development.
Table of Precedents Cited
| Precedent |
Rule or Principle Cited For |
Application by the Court |
| Pilkington v Secretary of State for the Environment [1973] 1 WLR 1527 |
Where implementation of one permission makes another physically impossible, further reliance on the latter is unlawful. |
Core authority: later works under post-1987 permissions rendered the 1967 scheme impossible. |
| Pioneer Aggregates (UK) Ltd v Secretary of State [1985] AC 132 |
No doctrine of abandonment exists in planning law; permissions run with the land unless statute or terms say otherwise. |
Rejected the Appellant’s “abandonment” analysis. |
| Finney v Welsh Ministers [2019] EWCA Civ 1868 |
Section 73 cannot alter the description of development. |
Illustrated limited statutory powers to vary existing permissions. |
| Trump International Golf Club Scotland Ltd v Scottish Ministers [2016] 1 WLR 85 |
General principles for interpreting planning permissions. |
Guided the Court’s objective, contextual reading of each permission. |
| Lambeth LBC v Secretary of State [2019] 1 WLR 4317 |
Same interpretive principles as above. |
Applied in construing post-1987 permissions. |
| Prestige Homes (Southern) Ltd (1992) 64 P&CR 502 |
Mere incompatibility between permissions does not automatically void the second; physical impossibility test governs. |
Supported the distinction between inconsistency and impossibility. |
| Lever Finance Ltd v Westminster LBC [1971] 1 QB 222 |
Only material departures affect validity of ongoing works. |
Underpinned the “materiality” threshold. |
| Sage v Secretary of State [2003] UKHL 22 |
Holistic approach to determining substantial completion for enforcement. |
Distinguished; not authority for invalidating earlier lawful works. |
| Robert Hitchins Ltd v Worcestershire CC [2015] EWCA Civ 1060 |
Developer may switch between overlapping permissions if each is followed as granted. |
Confirmed that multiple permissions may coexist but only one can be pursued at any time. |
Court's Reasoning and Analysis
1. Abandonment rejected. Drawing on Pioneer Aggregates, the Court held that planning permissions cannot be lost by abandonment; the Pilkington test based on physical impossibility, not election or waiver, applies.
2. Non-severability of multi-unit schemes. The 1967 permission authorised an integrated estate of 401 dwellings and roads. Consistent with policy considerations and authority, such permissions are seldom severable; partial implementation is lawful only while full implementation remains physically feasible. The earlier decision in Lucas (1964) was expressly disapproved as wrongly treating an estate permission as severable.
3. Limited statutory power to vary permissions. Sections 73 and 96A of the 1990 Act allow only minor or conditional changes. None of the post-1987 permissions purported to be, nor could lawfully be, material variations of the 1967 permission for the entire site.
4. Construction of post-1987 permissions. A reasonable reader, confined to the permission documents and any referenced plans, would view each later permission as a stand-alone consent for a discrete plot. The Appellant produced no evidence (e.g., revised master plan, environmental material) showing that any of those applications sought a new holistic permission.
5. Physical impossibility demonstrated. Works authorised by permissions A, B, E, G, D and H, plus additional unpermitted structures, occupy land earmarked for roads or houses on the Master Plan. Consequently, building out the remaining parts of that plan is now impossible without breaching the later permissions or demolishing existing buildings.
6. Materiality threshold met. The deviations are significant—roads realigned, houses sited across estate roads—and therefore constitute material departures extinguishing the practical effect of the 1967 permission.
Holding and Implications
HOLDING: Appeal DISMISSED. No further development may lawfully be carried out under the 1967 permission.
Implications: The judgment re-affirms and clarifies the Pilkington principle: once subsequent development makes an earlier multi-unit scheme physically impossible, the earlier permission ceases to authorise further works. It confirms that multi-unit permissions are generally non-severable, that true “variations” require a fresh, site-wide permission (unless falling within statutory minor-change powers), and that abandonment has no place in planning law. While the decision imposes procedural discipline on developers, it does not create new precedent; rather, it consolidates existing doctrines on overlapping permissions and statutory limits on variation.