Kerr v Welsh Ministers & Powys County Council & Nightfly Limited & Philip Wilding [2026] EWHC 1070 (Admin)
Kerr CLEUD fallback is a useful Planning Court judgment on how a certificate of lawfulness is interpreted and how the lawful use it confirms can operate as a fallback position in a later planning appeal.
The court rejected an attempt to read additional numerical limits into a 1998 certificate from surrounding correspondence. The certificate had to be construed objectively from its own wording and the documents it actually incorporated.
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- Neutral citation
- [2026] EWHC 1070 (Admin)
- Court
- High Court, King's Bench Division, Planning Court
- Judgment date
- 11th May 2026
- Judge
- HHJ Keyser KC, sitting as a Judge of the High Court
- Case number
- AC-2025-CDF-000160
What Kerr decided
The case concerned Rhydblawd Farm at Disserth, Builth Wells in Powys. The site had a long-established motocross use which was the subject of a certificate of lawful existing use or development issued in 1998.
Years later, an Inspector allowed a planning appeal for a wider motocross experience-centre scheme including associated buildings, parking and holiday accommodation. In assessing the appeal, the Inspector treated the lawful motocross use confirmed by the certificate as an important fallback or baseline.
Mr Kerr challenged that decision under section 288 of the Town and Country Planning Act 1990. His challenge failed on all three grounds.
A CLEUD is interpreted objectively
The central dispute was what the 1998 certificate actually authorised. The claimant argued that correspondence and material associated with the original application imposed tighter restrictions on the number of motorcycles using the site.
HHJ Keyser KC rejected that interpretation. The starting point was the objective meaning of the certificate itself. A certificate can incorporate another document by sufficiently clear reference, but material submitted during the application does not automatically become part of the certificate.
That distinction is crucial because a lawful-development certificate is intended to provide certainty about the lawful planning position of land.
Application material does not automatically limit the certificate
The 1998 certificate referred to the pattern and timing of motocross practices and events. The claimant sought to derive an additional restriction on participant or motorcycle numbers from other material generated around the application.
The court held that the Inspector had been entitled to reject that argument. The alleged numerical restriction was not expressed in the certificate in the way contended and the surrounding documents did not justify reading it in.
For practical guidance on what certificates establish, see Planning Geek’s guide to Certificates of Lawful Existing Use or Development.
The lawful use could be a real fallback
A fallback position is relevant where there is a real prospect that the alternative lawful development or use would occur if the proposal were refused.
Because the Inspector was entitled to understand the CLEUD as he did, he was also entitled to assess the appeal against that lawful baseline. The existing ability to carry on motocross activity without the numerical restriction asserted by the claimant was therefore a material consideration in the planning balance.
Planning Geek’s fallback position guide explains the wider test.
The case is useful beyond motocross sites
Kerr is particularly relevant when older certificates use short wording but the application file contains lengthy correspondence, plans or supporting material.
Do not assume every statement in the historic file qualifies the lawful use. The first task is to identify what the certificate expressly says and which documents, if any, it incorporates into its operative description.
That can materially change the baseline for a later application or appeal.
A Wales case with wider certificate value
The planning appeal arose in Wales and the statutory review challenged a decision of an Inspector appointed by the Welsh Ministers. The reasoning on the construction of the certificate and the use of a genuine fallback position is nevertheless valuable when working with lawful-development certificates more generally.
Read the full Kerr judgment
The full Planning Court judgment is held in the Planning Geek case law library. Gold Members can open the protected PDF below.
Kerr CLEUD Fallback Case Law Page Updated: 10th September 2026