Cummins sold Walker & Son 50 megawatts of gas generation under a case study whose stated purpose included “adhering to strict emissions regulations”. It even gave one section the reassuring little title “Power and compliance”. Unfortunately, Walker & Son’s public record contains a guilty plea for knowingly permitting an unpermitted waste operation, a failed Court of Appeal challenge, a refused trip to the Supreme Court and, years later, a separate £30,064 Environment Agency climate-regime penalty for carrying out a regulated activity without a permit. Somewhere between the brochure and the regulator, the word “permit” appears to have developed a fucking recurring role.
Cummins loves compliance when it arrives bolted inside a container and invoiced by the megawatt.
Its Walker & Son case study is a handsome piece of industrial reassurance. Walker & Son (Hauliers) Ltd, described as a fourth-generation transport and commercial-property business, wanted reliable and responsive power. Cummins supplied 25 C2000N5C 2MW QSV91G gas generator sets, delivering 50MW across three sites, complete with PowerCommand controls, remote monitoring, mechanical and electrical works and commissioning.
Those machines were quick too. Cummins said each site could come online within two minutes when the National Grid called. Two locations received 20MW apiece while the third received 10MW, all waiting for those moments when the electricity system needed something large, expensive and combustible to wake up quickly.
Then the brochure puts on its green tie.
Power And Compliance, Apparently
Cummins talks about UK decarbonisation, renewable-energy penetration and reducing carbon emissions before presenting gas generation as part of the supporting cast. Renewables get the halo while fossil gas waits backstage with its engine running.
There is nothing especially remarkable about fast-response generation existing inside a grid increasingly supplied by variable renewables. The interesting part is how enthusiastically Cummins wraps Walker & Son’s installation in regulatory virtue. Its stated project objectives include “adhering to strict emissions regulations”, while another section carries the heading “Power and compliance”. Cummins says the generator sets met the Medium Combustion Plant Directive alongside G59 and G99 requirements, with noise constrained because the installations sat in urban areas.
All very tidy.
Compliance, however, is not a family-sized bucket of white paint. Meeting one set of generator requirements does not allow the residue to be rolled across the rest of a company’s regulatory history.
Walker & Son already had some history with that particular word.
Before The Gas Came The Smoke
Go back to Worksop.
Walker & Son acquired the former Dormer Tools site at Shireoaks Road in July 2008 for redevelopment. Around August 2009, the company awarded demolition work to Bloom (Plant) Ltd. By the following month, according to the later Court of Appeal judgment, residents were complaining about fires and “acrid and choking” fumes coming from the site.
Investigators found something rather less picturesque than demolition dust. Bloom had turned the location into an illegal waste-transfer station and was burning waste there. Material had entered the site unlawfully, the operation produced non-compliant aggregate from crushed waste, and investigators found asbestos mixed into the crushed material.
One factual distinction matters. The Court of Appeal judgment expressly records that Walker & Son and its employees did not themselves carry out the illegal transfer, treatment, burning or crushing. Bloom conducted those physical waste operations. Walker & Son’s legal problem concerned something different: whether, as landowner, the company had knowingly permitted a regulated facility to operate without the required environmental permit.
Director Richard Walker told investigators that he had periodically driven around the site and seen fires and crushing equipment. He explained that what he observed appeared consistent with demolition work: timber from demolished structures going onto fires and concrete from the site entering crushing machinery.
That distinction would eventually become the whole fucking case.
The Guilty Plea Came With A Dictionary Fight
Walker & Son challenged the prosecution’s interpretation of “knowingly permitting”.
The company argued that the Environment Agency had to prove not only that Walker & Son knew the relevant activities were occurring, but also that it knew those activities fell outside an environmental permit. Prosecutors took the narrower view: prove knowledge of the activities, prove that Walker & Son permitted them, then establish separately that no environmental permit authorised them.
Judge Lea rejected Walker & Son’s interpretation.
On 31 January 2013, the company pleaded guilty to knowingly permitting the operation of a regulated facility without an environmental permit. Prosecutors left a related charge, covering the subsequent regulatory framework, on the file.
Walker & Son appealed. The Court of Appeal dismissed the challenge in 2014 and held that the required knowledge concerned the facts of what was happening and the act of permitting it. The prosecution did not additionally need to prove that the landowner understood the technical existence or scope of the environmental authorisation.
There is a fairly obvious policy reason for that. Environmental law would become rather fucking decorative if somebody could know exactly what was happening on their land, avoid checking whether it was permitted, then produce ignorance of the permit as the escape hatch.
The Court of Appeal was not interested in installing that door.
Supreme Court: Door Closed
Walker & Son next sought permission to take the dispute to the UK Supreme Court.
Three Supreme Court justices considered the application and refused permission on 11 December 2014. They concluded that the case did not raise an arguable point of law of general public importance that ought to reach the Supreme Court, particularly after the courts below had already determined and reviewed the issue.
By then, the route was fairly comprehensively mapped: Crown Court ruling, guilty plea, Court of Appeal dismissal and Supreme Court permission refused.
It could comfortably have remained an old environmental conviction attached to a redevelopment job from another decade. Contractors fuck things up. Companies learn. Procedures change and time does its work.
Except the permit problem came back.
A Different Regime. The Same Missing Piece Of Paper.
On 2 July 2025, the Environment Agency imposed a £30,064 civil penalty on Walker & Son (Hauliers) Limited.
This was not the Worksop case reheated. It concerned a separate regulatory regime and activity many years later. The Environment Agency’s climate-change civil-penalty record says Walker & Son carried out a regulated activity at an installation without a permit between 23 August 2018 and 3 June 2019, contrary to regulation 9 of the Greenhouse Gas Emissions Trading Scheme Regulations 2012.
The public penalty entry does not identify the particular installation involved, and TCAP has found no evidence establishing that it concerned one of the Cummins generator sites. This article therefore makes no such claim.
It does not fucking need to.
The same legal company whose earlier environmental conviction became a reported Court of Appeal authority on knowingly permitting an unpermitted activity later received a separate Environment Agency penalty under a climate-change regime because another regulated activity operated without a permit.
Different law, different period and different enforcement action.
The same stubborn little noun survives: permit.
Then Cummins Revised The Brochure
This is where The Generator Files earns its coffee.
An earlier copy of the Cummins Walker & Son case study carries a 3/20 publication mark. The version now sitting in Cummins’ media library carries Rev. 1/26.
The Environment Agency imposed its penalty in July 2025. Cummins’ current brochure carries a January 2026 revision date.
TCAP has no evidence showing what Cummins knew about Walker & Son’s wider regulatory history when it revised the document, nor what substantive changes somebody made between the 2020 and 2026 versions. There is no basis for inventing either.
What we can see is what survived.
The project still speaks of “adhering to strict emissions regulations”. Its “Power and compliance” heading remains in place, and Cummins continues to describe Walker & Son’s gas-generation programme through the language of emissions rules, regulatory requirements and what it calls reliable and sustainable power.
Somebody reopened the brochure after the 2025 Environment Agency penalty. Whatever else changed, the compliance hymn sheet made it out alive.
Walker Has Its Own Compliance Vocabulary
Cummins is not the only company in this relationship that enjoys reassuring nouns.
Walker & Son’s own website says the business commits itself to the “highest levels of Health, Safety, Environment & Quality” and continually reassesses its policies and procedures so customers can remain confident in the operation.
Another company article celebrates ISO 9001 certification and says it demonstrates Walker & Son’s continued ability to provide products and services meeting customer and industry regulatory requirements.
None of this means ISO 9001 guarantees environmental compliance. Nor does an old environmental offence somehow invalidate a quality-management certificate years later. The value lies in the contrast.
Businesses voluntarily construct immaculate verbal showrooms around governance: highest standards, procedures, regulatory requirements, power and compliance, strict emissions regulations. Then somebody walks around the back of the building and starts opening the public registers.
That is usually where TCAP finds the interesting shit.
Another Regulator Leaves A Note
There is another entry worth recording, although the published document gives substantially less detail.
In April 2024, Walker & Son appeared at a public inquiry before the Traffic Commissioner in Leeds concerning its goods-vehicle operator’s licence. The published Applications and Decisions notice records regulatory action under section 26. The Traffic Commissioner issued a formal warning and added an undertaking to the licence.
That notice identifies Walker & Son and its directors but does not explain the underlying conduct in enough detail for TCAP to build a grand theory around it. So we won’t.
The narrower point does the job. By 2024, another regulator had entered Walker & Son’s paperwork and left something behind: not revocation, not disqualification, but a formal warning and an undertaking.
Another line in the ledger.
And Yes, They Have Permits Now
The current Environment Agency register deserves the same treatment as the ugly entries: read it rather than selectively ignoring it.
Walker & Son presently holds an environmental permit for Balby A Generator, which the Environment Agency issued in February 2022. The public register also lists Balby B Generator under Walker & Son with its own permit reference.
That matters because this is not an allegation that Walker & Son’s present generator operations simply sit outside environmental regulation. The available public register shows current permits.
It also makes the basic concept wonderfully easy to understand. Companies can obtain permits, and Walker & Son has obtained them. A permit today does not retrospectively erase a criminal conviction from yesterday, just as present compliance cannot cancel a later civil penalty concerning a separate earlier period of unpermitted regulated activity.
Compliance is not a loyalty card. Ten stamps now do not get the old breach free.
Fifty Megawatts Of Corporate Poetry
Strip the marketing away and Cummins appears to have done what it does very well.
It supplied 25 two-megawatt gas generator sets, switching and control systems, mechanical work, electrical work, commissioning and fast-start capability. Fifty megawatts of serious machinery could wake up quickly when the grid called for it.
That is engineering. The adjectives arrived afterwards: decarbonisation, sustainability, compliance and strict emissions regulations.
That is marketing, and The Generator Files lives in the gap between the two.
Nothing TCAP has found establishes that Walker & Son’s Cummins generators breached the MCPD requirements Cummins says they met. Making that allegation would require different evidence.
The documented record is more interesting anyway. Cummins chose Walker & Son as a public customer success story and wrapped the relationship in the vocabulary of environmental compliance. Walker & Son’s wider history contains a guilty plea for knowingly permitting an unpermitted regulated facility, a failed Court of Appeal challenge, a refused Supreme Court application, a later £30,064 Environment Agency climate penalty for carrying out regulated activity without a permit and a subsequent Traffic Commissioner formal warning.
That is not guilt by association. It is reading past page four of the fucking brochure.
Cummins supplied the power. TCAP opened the files, and underneath 50 megawatts of “Power and compliance”, the same problem keeps appearing in the paperwork.
Strict emissions regulations. Loose fucking permits.
Lee Thompson – Founder, The Cummins Accountability Project
Sources
- Cummins – Rigid Gas Power Helps Transport Company Meet National Energy Goals
- Cummins – Original Walker & Son Gas Power Case Study
- Court Of Appeal – Walker & Son (Hauliers) Ltd v Environment Agency [2014] EWCA Crim 100
- Counsel Magazine – Walker & Son (Hauliers) Ltd v Environment Agency
- UK Supreme Court – Permission To Appeal Results, December 2014
- Environment Agency – Climate Change Civil Penalties
- Violation Tracker UK – Walker & Son (Hauliers) Limited
- Environment Agency – Walker & Son Balby A Generator Permit
- Environment Agency – Industrial Installation Public Register
- GOV.UK – Goods Vehicle Applications And Decisions For The North East Of England
- Walker & Son – Health, Safety, Environment And Quality
- Walker & Son – ISO 9001 Certification
- Companies House – Walker & Son (Hauliers) Limited