Timothy Bent v Cambridgeshire County Council and Wicken Lime and Stone Company Ltd t/a Frances Flower (Eastern) [2017] EWHC 1366 (Admin)
Bent is a useful Planning Court judgment on noise, Planning Practice Guidance and the drafting of technical planning conditions. It confirms that a noise condition is not automatically uncertain or unenforceable simply because specialists will need to exercise professional judgment when testing compliance.
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- Neutral citation
- [2017] EWHC 1366 (Admin)
- Court
- High Court of Justice, Queen's Bench Division, Planning Court
- Judgment date
- 9th June 2017
- Judge
- David Elvin QC, sitting as a Deputy High Court Judge
- Case number
- CO/4302/2016
What Bent decided
Cambridgeshire County Council granted permission for an extension to Dimmock’s Cote Quarry near Wicken. The development would allow limestone extraction from a further 9.1 hectares over about 18.5 years, together with imported inert material for restoration.
Mr Bent lived close to the northern boundary of the proposed extension. His principal concern was additional quarry noise and its effect on the enjoyment of his home and land.
He challenged the permission on three grounds: the council had allegedly failed properly to apply national minerals noise guidance, had given inadequate reasons and had imposed an unenforceable noise condition.
All three grounds failed.
The PPG did not have to be repeated word for word
The relevant minerals guidance said the authority should aim for quarry noise no more than 10dB above the background level during normal working hours. Where achieving that would impose an unreasonable burden on the operator, the limit should be as near to that level as practicable, subject to an overall 55dB upper limit.
The environmental health officer had not quoted the whole paragraph verbatim. She did, however, expressly refer to the 55dB upper limit, to levels being as near to 10dB above background as practicable and to the relevant planning guidance.
David Elvin QC held that the evidence showed the guidance had been understood and applied. There was no need for it to be recited mantra-like in the officer advice or committee report.
Our wider guide explains the use of noise evidence in planning applications.
The proposed noise bund was a matter of planning judgment
Mr Bent had argued for a further bund along the northern boundary to reduce noise. The applicant’s acoustic assessment predicted that a three-metre bund would reduce noise by less than 2dB in most scenarios, described as a barely perceptible reduction.
The council decided not to require it and instead relied on noise limits and a detailed noise management plan.
The court held that this was a planning judgment the authority was entitled to make. The technical evidence supported the conclusion that the modest attenuation did not justify requiring the bund.
The reasons were legally adequate
The court could understand from the officer report why the council considered the noise impacts acceptable with mitigation and why the further bund had been rejected.
The decision therefore did not leave genuine doubt about what the council had decided or why. A forensic search for every missing phrase was not the correct approach to the reasons challenge.
The BS4142 noise condition was enforceable
Condition 13 set numerical noise limits at nearby properties and said noise should be measured or calculated in accordance with BS4142 and the Planning Practice Guidance.
The challenge argued that the condition was uncertain because it did not specify which version of BS4142 applied and because the standard did not cover every possible low-frequency issue.
The court rejected that argument. The natural inference was that the condition referred to BS4142:2014, the version in force when permission was granted. That standard contained substantial guidance on instrumentation, measurement procedures, background sound, rating levels, uncertainty and impact assessment.
A technical condition can require professional judgment
Bent applies an important practical principle from the earlier noise-condition authorities. A planning condition does not have to specify every measurement, dimension or methodological step which a specialist may need when deciding whether the condition has been breached.
Noise conditions will often be administered by environmental health officers or acousticians. The fact that experts may use professional judgment, or even disagree over the best technical method, does not by itself make a condition unlawful.
The real question is whether the condition, read reasonably and in context, has a sensible and ascertainable meaning.
The court put the distinction neatly: uncertainty should not be confused with matters left to the exercise of technical expert judgment.
See our main guide to planning conditions.
Later expert evidence cannot normally retry the planning merits
The litigation also contained new acoustic evidence produced after the planning decision. The court was critical of attempts by both sides to use later expert material to reinforce or undermine the technical planning judgment made at the time.
Judicial review is not an opportunity to retry a planning application on its merits using evidence the decision-maker never had.
There can be exceptional cases where later evidence is admissible, but the normal focus is on whether the decision was lawful on the material that was before the authority when it decided the application.
Later witness evidence can explain but not repair a decision
The court also discussed witness statements from the officers involved in the original decision.
Evidence can sometimes explain the factual process or elucidate what a contemporaneous report meant. It cannot contradict the original record or be used to make good a defect which existed in the decision-making material itself.
That is a useful general public-law point when a planning permission is later challenged.
Why Bent still matters
The precise minerals guidance and technical standards should always be checked in their current form. The enduring value of Bent is broader.
It shows that national guidance must be genuinely understood and applied, but not mechanically quoted. It also provides a strong example of the courts recognising that technical planning conditions often have to be operated by specialists exercising professional judgment.
Read the full Bent judgment
The approved Planning Court judgment is held in the Planning Geek case law library. Gold Members can open the protected PDF below.
Related Planning Geek guidance
See Noise in planning applications and Planning conditions.
Bent Case Law Page Updated: 9th September 2026