| R (Law Society) v Lord Chancellor [2018] EWHC 2094 (Admin); [2019] 1 WLR 1649 |
Test for irrationality: (a) whether decision was outside the range of reasonable decisions; (b) whether the decision-making process was flawed (irrelevant considerations, no evidence for an important step, serious logical or methodological error). |
The court applied this two-part formulation as the governing test for irrationality in the judicial review challenge. |
| R (Centro) v Secretary of State for Transport [2007] EWHC 2729 |
Illustrates high threshold for irrationality in predictive/resource judgment contexts. |
Cited to support the proposition that courts should be cautious when reviewing resource allocation and predictive judgments by public bodies. |
| R (TTT) v Michaela Community Schools Trust [2024] EWHC 843 (Admin) |
Authority on deference where decision involves operational expertise. |
Used to underline the high threshold for irrationality when decisions rest on operational financial judgments. |
| R (SB) v Governors of Denbigh High School [2007] 1 AC 100 |
Warning against courts overruling decisions which involve experienced professionals' judgments. |
Referenced in support of deference to decision-makers with relevant expertise. |
| Secretary of State for Education and Science v Tameside MBC [1977] AC 1014 |
Duty of decision-maker to take reasonable steps to acquaint itself with relevant information (the "Tameside duty"). |
Applied to assess whether Company A took reasonable steps to inform itself about potential savings from continuing to operate the Homes. |
| R (Plantagenet Alliance Ltd) v Secretary of State of Justice [2014] EWHC 1662 (Admin) |
Summarises scope of Tameside duty and principles on reasonable inquiries. |
Cited for the proposition that the obligation is to take reasonable steps only and that intensity/manner of inquiry is for the decision-maker. |
| R (Khatun) v Newham LBC [2005] QB 37 |
Decision on deference to public body regarding manner and intensity of inquiries. |
Cited to reinforce that courts should not interfere simply because further inquiries would have been sensible. |
| R (Bayani) v. Kensington and Chelsea Royal LBC (1990) 22 HLR 406 |
Standard that court should only intervene if no reasonable authority could have been satisfied on inquiries made. |
Applied in discussing limits of Tameside duty challenge. |
| R (Costello) v Nottingham City Council (1989) 21 HLR 301 |
Principle on sufficiency of inquiries before decision-making. |
Cited in support of approach assessing whether inquiries were sufficient. |
| R (London Borough of Southwark) v Secretary of State for Education |
On duty to call attention to relevant considerations, possibly requiring outside consultation. |
Cited for the principle that decision-maker must inform itself to reach a rational conclusion. |
| R (Venables) v Secretary of State for the Home Department [1998] AC 407 |
Wider the discretion, more important to have all relevant material. |
Referenced in discussing scope of inquiry required for broad discretions. |
| R (Talpada) v Secretary of State for the Home Department [2018] EWCA Civ 841 |
Case management and procedural rigor in public law proceedings. |
Cited in relation to the pleadings point and the judge's case management discretion. |
| R (Bibi) v Secretary of State for the Home Department [2025] EWCA Civ 622 |
Case management and procedural expectations in JR litigation. |
Referenced by the judge when considering the pleading objection. |
| Mansell v Tonbridge & Malling BC [2017] EWCA Civ 1314 |
Approach to interplay between officer recommendations and decision-maker in committee decisions. |
Adopted as apposite guidance for reading officer reports benevolently and assessing material misdirection. |
| R. v Selby District Council, ex parte Oxton Farms [1997] EGCS 60 |
Principles on reading officers' reports and committee decision-making. |
Referred to as part of Mansell synthesis on benevolent reading of reports. |
| R. (on the application of Siraj) v Kirklees Metropolitan Borough Council [2010] EWCA Civ 1286 |
Reading officers' reports with reasonable benevolence. |
Cited to support approach that reports should be read in context by councillors with local knowledge. |
| R. (on the application of Zurich Assurance Ltd., t/a Threadneedle Property Investments) v North Lincolnshire Council [2012] EWHC 3708 (Admin) |
Application of benevolent reading to officers' reports. |
Referenced in support of Mansell principles. |
| R. (on the application of Morge) v Hampshire County Council [2011] UKSC 2 |
Reports written for councillors; not to be read with undue rigour. |
Cited to emphasise practical reading of officer advice. |
| R. v Mendip District Council, ex parte Fabre (2000) 80 P. & C.R. 500 |
Support for benevolent reading of officer reports. |
Used as part of the Mansell synthesis. |
| Palmer v Herefordshire Council [2016] EWCA Civ 1061 |
Assumption that members follow officer recommendations based on advice given. |
Applied to the proposition that, unless shown otherwise, members relied on officer advice. |
| R. (on the application of Loader) v Rother District Council [2016] EWCA Civ 795 |
Example where officer's factual error materially misled committee. |
Cited to show circumstances where courts will intervene if officer advice materially misleads. |
| Watermead Parish Council v Aylesbury Vale District Council [2017] EWCA Civ 152 |
Example where officer misdirection on policy meaning required interference. |
Used in Mansell discussion of material misdirection. |
| R. (on the application of Williams) v Powys County Council [2017] EWCA Civ 427 |
Officer failure to provide explicit advice on a matter on which committee ought to receive it. |
Cited as an example of when courts will intervene. |
| R(KP) v Secretary of State for Foreign, Commonwealth and Development Affairs [2025] EWHC 370 (Admin) |
Serious logical or methodological error contemplated as basis for irrationality. |
Cited by the judge as describing the kind of "logical error or critical gap" that can render a decision unlawful. |
| R (Wells) v Parole Board [2019] EWHC 2710 (Admin) |
Reference to unexplained evidential gap or leap in reasoning as grounds for irrationality. |
Cited in discussion of what constitutes serious logical or methodological error. |