Various people have asked me what I made of the amendment to the Planning and Infrastructure Bill that Lord Charlie Banner KC sought to introduce last month, seeking to lance the large boil that is Hillside (and if that word means nothing (1) lucky you, read no further, or (2) please read my 2 November 2022 blog post Running Down That Hillside).
The truth is that for a long time I couldn’t really face getting back into the subject, having failed to get traction for expansion of what became section 73B when the Levelling-up and Regeneration Act Bill was passing through its Parliamentary stages, and, before that, having sat behind Charlie at the Hillside Supreme Court hearing. The problem is real, but arriving at a workable solution is hard.
The amendment was as follows:
Huge credit to Charlie because, if nothing else, his amendment has put the issue back on the table with MHCLG. Baroness Taylor’s response in the debate on 11 September 2025 (see columns 1736 to 1741), contained the following passages:
“The Government recognise that the Hillside judgment and subsequent court decisions have caused concerns across the development sector, and the noble Lord was kind enough to send me some of the articles that have been written since, setting out which problems they are causing. It has made it more challenging to use the practice of drop-in permissions to deal with changes in development proposals for plots on large-scale residential and commercial development in response to changing circumstances.”
“We want to ensure that large-scale developments, where they need to change, can secure the necessary consents to deal with these changes effectively and proportionately. Unfortunately, we are not persuaded that Amendment 169 is the solution to Hillside for overlapping planning permissions. It is too broad in scope, and we must be absolutely sure that it would not undermine the integrity of the planning system. The long-standing principle that Hillside endorsed—that it is unlawful to carry out a development when another permission makes it physically impossible to carry it out—is a sound one. Decisions are made on the merits of the entire development proposal, and this amendment would allow developers to pick and choose what parts of an approved development they wanted to implement when they had a choice.
Similarly, we need to consider carefully the implications of legislating to deal with overlapping planning permissions and development consent orders in general terms. […]
“We want to ensure that there is sufficient flexibility to deal with change to large-scale developments. Clause 11 already provides a framework for a more streamlined and proportionate process to change development consent orders, but we also want to look at how the framework can be improved for planning permissions. We would welcome further discussions with your Lordships and the wider sector on this matter.”
All this stuff about considering carefully and further discussions is all well and good but perhaps the next step now should be to keep a number of planners and planning lawyers in a locked room until they have arrived at a refined version of the proposal which is watertight, legally and in public policy terms? What situations are people actually worried may arise? How can those outcomes be designed out?
I don’t want to be locked in the room but to start the discussion…
I think we need a bit of clarity as to how an authority actually states in the later permission or in a section 106 agreement that the lawfulness of past and future development carried out pursuant to one of those planning permissions shall be affected. This wouldn’t really appropriately be done by way of a planning condition. Nor would it be part of the operative part of the permission. A statement of the legal effect of implementation of the permission on another permission or permissions sounds more like a role for an informative (although to have such a declaration with legal effect within an informative would be unprecedented and something for subsequent purchasers’ solicitors to root around for in acquisition due diligence processes) but what are the guardrails, for instance:
(1) Surely the local planning authority shouldn’t by this route be able to affect the lawfulness of past development (the Supreme Court in Hillside ruled out any potential effect on the lawfulness of development which has already happened)?
(2) Surely a statement as to the lawfulness of future development to be carried out under an existing permission should only be possible where otherwise Hillside could cause a problem ie where there would potentially be materially inconsistent development? Otherwise this could end up being potentially more constraining, dependent on the attitude of the relevant local planning authority.
(3) How can the rights of a landowner with the benefit of at least part of the existing planning permission be protected rather than find out after the event that another party has secured a permission with a statement that (potentially without justification) affects that landowner’s ability to continue to rely on that earlier permission?
(4) What is to prevent the outcome being a planning permission which allows plainly inconsistent planning permissions to be built out free even of the traditional Pilkington constraints?
These are the sorts of real-world issues the final version of any legislative provision would need to cover off. The drafting will be gnarly…
Secondly, we need to think about what procedural mechanisms would need to be put in place. For instance:
- Should the planning application form include a question asking if within the planning application red line area there are any planning permissions on which the applicant still wishes to rely alongside implementation of any planning permission granted pursuant to this application, warning that if this question is not answered correctly, the consequence of implementing the planning permission sought may be that previously granted planning permissions may no longer be able to relied upon?
- Should Planning Practice Guidance direct a local planning authority, in determining an application for planning permission, specifically to consider in a section of its relevant officer’s report whether there are any existing planning permissions, which relate to some or all of the land the subject of this planning application, and if so whether or not it would be appropriate in planning terms for further development to be carried out under each of those permissions should this application be approved and implemented? And might digital planning, possibly even the Extract tool, make this less of a paperchase than traditionally it certainly would be?
It’s good that people are thinking about all this again. But it is darned hard! Mountain not hill.
Simon Ricketts, 3 October 2025
Personal views, et cetera
SIMONICITY 