There was an interesting Hillside after-tremor this week by way of R (Dennis) v London Borough of Southwark (Holgate J, 17 January 2024) which may prove useful in giving more practical guidance as to the approach to drop-in applications in the context of modern multi-phase masterplan-style permissions.
(For a quick refresher on the Hillside judgment itself, see my 2 November 2022 blog post Running Down That Hillside)
In Dennis an objector challenged the decision by Southwark Council to grant a section 96A (non-material amendments) approval the effect of which was intended to make an outline planning permission for the phased redevelopment and regeneration of the Aylesbury Estate in south east London “severable” (within the meaning of the Hillside judgment) by the insertion of that word into the description of development authorised by the outline planning permission. The claimant contended that the amendment was “material” and therefore outside the scope of section 96A. Southwark Council and the developer, Notting Hill Genesis, submitted that the outline planning permission should be interpreted as “severable” in any event and that the amendment sought was just by way of caution. The amendment was made so as to pave the way for implementation of a drop-in permission for development within one of the phases, which would be inconsistent with what the outline planning permission had authorised. The drop-in application had been resolved to be approved subject to grant of the section 96A application.
There are already a few particular aspects as to the facts which need to be borne in mind before applying the judgment more broadly:
- The approach to seeking to make a particular phase “severable”, in Hillside terms, from the rest of the permission was simply by way of introducing the word “severable” into the description of development!
- The parties disagreed as to whether the permission was already to be construed as severable but agreed for the purposes of the litigation that if it was not already severable the amendment would be material and therefore fell outside of section 96A. The judge did not reach a ruling that changes to accommodate drop-in applications are necessarily material and of course that will be a matter for the planning judgment of the decision-maker in every case.
- The amendment was by way of securing “severability” rather than adjusting the permission so that building it out would not be materially incompatible with what was to come forward by way of a drop-in application.
This is to be contrasted by many Hillside strategies that we see, where alongside submission of the drop-in application care is taken to amend the existing permission to the extent necessary to achieve material physical compatibility – often by way of section 96A because the local planning authority in its planning judgment determines those amendments not to be material. This after all makes sense and, whilst I might have some sympathy for objectors where the strategy is taken that was taken in Dennis, where there would be no control over what might come forward on the severed part of the permission, I don’t have any sympathy where it is perfectly clear what the changes are, by virtue of the drop-in application having been made, accompanied by full assessments of the acceptability of the proposal in the context of the wider consented development and where this is all reported to committee so that everyone is clear and has a full opportunity to make representations to the same extent as if the whole development had been the subject of a fresh application (the Supreme Court’s impractical suggestion in Hillside).
So what did we learn from Dennis, aside from the extent to which Hillside issues remain a menace for all concerned, and aside from being reminded, again, that the Government really should have grasped the nettle and legislated to address the problem in the way that many of us urged (we even provided draft clauses!) rather than sticking with introducing via LURA the very weak section 73B procedural option into the 1990 Act?
- Hillside applies as much to outline planning permissions as to full permissions.
- Care is needed as to the word “severable” used by the Supreme Court in Hillside. Simply inserting the bare term “severable” into a permission does not make it severable.
- Phasing alone does not connote severability. Indeed, “if the inclusion of phasing provisions were to be sufficient to sever a planning permission, whether detailed or outline, that could have consequences which nobody involved in seeking or granting that permission would have envisaged, such as the application of the statutory time limits for the implementation of each separate permission. For example, if the outline permission in Percy Bilton had been treated by the court as severed, the statutory time limits for submitting reserved matters for approval would have applied to each of the resulting discrete permissions and so some of those consents would have become time-expired. That was the issue in the case. Practitioners will therefore need to consider carefully the possible consequences of seeking to argue that a single planning permission should be treated as severed.”
A final point to note is that this case arose not from a challenge to the approval of the drop-in application (quite right, see my 15 December 2023 blog post Permission Incompatibility Not Relevant For The Decision Maker – Court of Appeal In Fiske). The case arose from the attempt of the developer to ensure, by way of the section 96A application, that implementation of that drop-in permission would not lead to a risk that the existing planning permission could no longer be relied on. I would comment that it is of course open to the developer to seek again to amend the permission such that the proposals can proceed.
I noted the statement in Planning Resource from the Public Interest Law Centre, which represented Dennis:
“This is an important judgement for housing campaigners across the country, as large estate redevelopments often unfold from outline planning permissions over time – or ‘phased’ like this. This case scrutinises the method in which developers use ‘drop in’ applications to deviate from what was promised to residents.”
My response would be: What really has been achieved by the challenge? What further assessments will be needed and further opportunity for views to be expressed, as a result of this outcome, that could not have been made in the context of the drop-in application? I’m sceptical.
On a separate note, I was really pleased at the beginning of the week to participate in a joint Landmark Chambers and Town Legal event, looking at the implications of the revised NPPF, chaired by Hashi Mohamed and with other panellists Rupert Warren KC, Anjoli Foster, Meeta Kaur and Sam Stafford. If you missed it (we were hugely oversubscribed), Sam has now put it out online as a 50 Shades of Planning podcast. Listen via this link or on Apple. Spotify etc.
Simon Ricketts, 20 January 2024
Personal views, et cetera

Image courtesy of Wikipedia

