The 37 Things

The Separation of Waste (England) Regulations 2024 is forty-three pages long. Schedule 1 — the part that specifies what goes where — runs across seven sections, organised by material type: glass, metal, plastic, paper and card, food, garden waste.

Somewhere in those pages is a list of 37 items banned from your recycling bin. At least, that's what the newspapers said. That's the number that made the headlines. "³⁷ things you can't recycle anymore." The number travelled from the tabloids to the broadsheets to the group chats. By January 2026, most people in England could tell you the number even if they couldn't name a single item on the list.

So here is where an investigation starts: with the document itself.

Schedule 1. Part 2: glass. Items listed by lettered subsection, not by number. Part 3: metal. Same structure. Part 4: plastic. Part 5: paper and card. Part 6: food. Part 7: garden waste. Categories, each containing specified items in lettered paragraphs.¹

The number 37 does not appear anywhere in the instrument.

Not in the schedules. Not in the explanatory notes. Not in the headings. The legislation uses categories — glass that isn't packaging, plastic that's compostable, paper that's been contaminated — and leaves the counting to whoever reads it. Count one way and you get 30. Count another and you might reach 37, or 34, or 41. The total depends on whether you treat "drinking glasses and candles" as two items or one category, whether you count "contaminated packaging" as an item or a condition, whether you include the fibre-based composite threshold in Part 5 as an exclusion or a specification.¹

The entire national conversation about Simpler Recycling is built on a number that is, strictly speaking, a matter of interpretation.

This is not the investigation. This is the first clue that something structural is happening — that the public's understanding and the regulatory reality are already speaking different languages before the first bin is sorted.

The Categories

The four mandatory waste streams, effective 31 March 2026:²

1. Residual waste (non-recyclable)
2. Food waste (weekly collection — may be co-collected with garden waste)
3. Paper and card
4. Mixed dry recyclables (plastic, metal, glass — including cartons)

Thirty-one councils have transitional exemptions, primarily for food waste collection, reviewed annually.²

The excluded items are the categories that do not need to be collected in any stream. They are not "banned from your bin" — they are items outside the scope of mandatory collection. The distinction matters legally if not practically: the legislation tells councils what they must collect, not householders what they cannot put out.¹

But the practical effect is the same. If your council doesn't have to collect it, it goes in the residual bin. And the residual bin goes to landfill or incineration.

Here is where it gets interesting.

The Cup

Among the excluded items is a category that reads like a footnote: plastic packaging or non-packaging items labelled "compostable" or "biodegradable." The GOV.UK household guidance lists these explicitly; Schedule 1 Part 4 of the SI excludes them by category rather than by name.⁴

A compostable coffee cup. A biodegradable takeaway container. A plant pot made from PLA — polylactic acid, the dominant compostable bioplastic. All excluded from the recycling stream.

The exclusion makes sense on its face. PLA melts at 150-160°C; PET — the plastic in most recyclable bottles — melts at approximately 260°C. If a PLA cup enters the PET recycling stream, it melts prematurely, clogs sorting equipment, and can degrade an entire batch.³ The contamination is asymmetric: one misplaced compostable cup can destroy kilograms of recyclable material. Excluding compostable plastic from recycling protects the recycling stream. Sound policy.

So the compostable cup goes in the food waste bin instead. Except it doesn't. Part 6 of Schedule 1 specifies that only food waste and biodegradable processing material are accepted in the food waste stream.¹ Compostable packaging — despite bearing the word "compostable" — is not food. The sole exception: compostable caddy liners, the bags used to line the food waste container.⁴

The compostable cup cannot go in the recycling bin. It cannot go in the food waste bin. Its destination, by elimination, is the residual bin. General waste. Landfill or incineration.

But this cup has a certification. A green seedling logo. Tested and verified under EN 13432 — the European standard for compostable packaging, established in 2000.⁵

I have mapped this certification before. Report 006 found that the standard is rigorous — and that the infrastructure to match it barely exists.⁶ But what Simpler Recycling does is different from what Report 006 found. Report 006 identified an infrastructure gap: the facilities don't exist. Simpler Recycling identifies something more precise. The facilities are no longer the point. The legislation itself routes the material away from any facility where the certification could be activated.

This is where the investigation turns from a missing number to a missing pathway.

The Intersection

EN 13432 certifies that a material will biodegrade under specific conditions.⁵ The conditions are exact:

• Temperature: 58°C ± 2°C
• Environment: aerobic (oxygen-rich), controlled humidity, active microbial population
• Duration: ≥90% biodegradation (measured by CO₂ generation) within 6 months
• Disintegration: ≥90% passes through a 2mm sieve after 12 weeks

These conditions describe an industrial composting facility. A large-scale, managed environment where temperature, oxygen, and moisture are controlled to accelerate decomposition. At 58°C, the polymer chains in PLA undergo hydrolytic chain scission — they shatter into fragments small enough for microbial enzymes to digest.⁷

Fifty-eight degrees Celsius. Run your kitchen tap to its hottest setting and hold your hand under it. UK building regulations require hot water to be stored at 60°C to prevent Legionella, but thermostatic mixing valves deliver it at no more than 48°C.⁸ The temperature at which PLA begins to decompose — the temperature the certification assumes — is hotter than the hottest water your tap can deliver. At 58°C, water causes serious burns in seconds.⁹

A UK landfill operates at 20-40°C.¹⁰ The mesophilic range. A warm bath is 38-40°C.⁹

The gap between the temperature that decomposes PLA and the temperature it will actually encounter is 18 to 38 degrees. This is not an administrative gap. It is a thermodynamic one. PLA has a glass transition temperature — the point at which its polymer chains shift from rigid and glassy to mobile and accessible — of approximately 60-65°C.⁷ Below that threshold, the chains stay locked. The enzymes that would break them down cannot reach them. The material sits.

How long does it sit?

Kolstad et al. (2012) — researchers from NatureWorks LLC and the Organic Waste Systems laboratory in Belgium — designed two test series to simulate 100 years of biologically active landfill conditions.¹¹ The first ran for 390 days at 21°C under accelerated conditions. The second used high-solids anaerobic digestion at 35°C for 170 days.

Semicrystalline PLA — the form used in more than 96% of commercial PLA products — produced no statistically significant quantity of biogas in either test.¹¹

Not 1%. Not slow degradation. No statistically significant degradation. The material that was certified to decompose in six months at 58°C does not meaningfully decompose at landfill temperatures over the equivalent of a century. The certification is correct. The decomposition is real — at the right temperature. The temperature the waste system provides is not the right temperature.

Two regulatory instruments. One certifies a capability at 58°C. The other routes the material to 20-40°C. Both are valid within their own domain. EN 13432 correctly describes what PLA does under industrial composting conditions. The Separation of Waste Regulations correctly exclude compostable plastics from recycling streams they would contaminate. Neither instrument contradicts the other on paper. But read them together — and own a thermometer — and the outcome is visible: a material certified to decompose, sent to conditions where it will persist for longer than the person who bought it.

Nobody checked whether the instruments were compatible. Nobody is tasked with checking. EN 13432 is a European standard maintained by CEN. The Separation of Waste Regulations are domestic legislation drafted by DEFRA. The certification lives in one regulatory universe. The waste system lives in another. The intersection — the place where a certified-compostable cup meets a residual waste bin — is nobody's jurisdiction.

I want to call this what it is. Two instruments, both correct within their own frame. One certifies a capability at a temperature that would scald your hand. The other routes the material to a temperature comfortable enough to bathe in. The gap between them is where the dead end lives. Someone would have to read both documents and own a thermometer to see it.

The Liner

There is one escape route. One permitted use of compostable packaging in the food waste stream: compostable caddy liners — the bags that line the small kitchen food waste container.⁴

A consumer buying compostable caddy liners is doing exactly what the system asks. Food scraps go in the compostable liner, the liner goes in the food caddy, the caddy goes out for collection. The liner and food arrive together at the processing facility.

The majority of England's separated food waste goes to anaerobic digestion — AD facilities that break down organic matter in sealed, oxygen-free tanks to generate biogas and digestate.¹² AD is the preferred route because it produces renewable energy and fertiliser. England's AD capacity for food waste reached 3.2 million tonnes by 2019.¹²

At the AD facility, a machine called a de-packager shreds incoming material and separates food from packaging. The de-packager operates on physical properties: density, tear resistance, thickness. It does not read logos. It does not check certifications. It cannot distinguish a compostable caddy liner from a conventional plastic bag.¹³

The North London Waste Authority — a statutory body serving seven London boroughs — states this plainly: all packaging, including compostable packaging, is removed by de-packaging machinery during AD processing and sent to general waste.¹³ WRAP's survey of AD and composting operators found that just under half reported growth in compostable packaging was having an impact on their business — as contamination, not as feedstock. Plastic-like contamination was identified as a significant operating cost, with operators unable to differentiate compostable from conventional plastic during processing.¹⁴

The compostable caddy liner arrives as food waste. It leaves as general waste. Landfill or incineration.

The consumer paid a premium for the compostable liner. The outcome is identical to a conventional plastic bag. The permission to use compostable liners in the food waste stream is real. The infrastructure that processes the food waste does not — cannot — honour it.

Twenty-four composting sites in the UK, certified under the Compost Certification Scheme, accept compostable packaging.¹⁵ Total capacity: approximately 30,000 tonnes.¹⁵ The escape route exists. It serves a fraction of the material produced.

The Other Side

Here is where the investigation widens.

A consumer who puts a glass candle in the recycling bin can receive a Fixed Penalty Notice. The power sits in sections 46A and 46B of the Environmental Protection Act 1990 — inserted by the Anti-social Behaviour, Crime and Policing Act 2014, not by Simpler Recycling.¹⁶ The process requires a prior written warning, identification of the specific failure, a compliance timeframe, and the threshold that the failure "has caused, or is or was likely to cause, a nuisance" or be "detrimental to the amenities of the locality."¹⁶ The default penalty is £60.¹⁶

In January 2026, the Daily Mail, Sun, and Mirror reported that Simpler Recycling would introduce new £400 fines for putting items in the wrong bin. DEFRA called the reports "completely false."¹⁷ The £400 figure likely originated from the fly-tipping penalty under section 33ZA of the same Act — a different offence entirely, with a statutory range of £150-£1,000 since July 2023.¹⁷ The media conflated two separate provisions. The recycling error penalty is £60-£80. The fly-tipping penalty is £150-£1,000 (many councils adopt £400). The public received the larger number because it confirmed what seventy years of consumer-blame framing had taught them to expect: that waste is their problem, and the consequences are theirs too.

Now consider the other direction.

Extended Producer Responsibility for packaging — EPR — launched alongside Simpler Recycling. Producers pay base fees per tonne of packaging placed on the UK market: £423 for plastic, £461 for fibre-based composites, £192 for glass.¹⁸ These are fees, not fines. They fund the waste management system.

From 2026-27, fee modulation begins. A Recyclability Assessment Methodology assigns every packaging format a rating: Red (not recyclable), Amber (recyclable with improvements), or Green (recyclable). Red-rated packaging attracts a fee multiplier — 1.2x in Year 2, rising to 2.0x by Year 4.¹⁹ The system is revenue-neutral: red fee increases fund green discounts.¹⁹

Forty-five per cent of plastic packaging is currently rated Red.¹⁹

The modulation statement — the document that specifies how producers pay more for unrecyclable packaging — contains no section on enforcement. No penalties for non-payment. No consequences for non-compliance. No reference to the Environment Agency's enforcement role.¹⁹ The EPR base fees guidance is the same: fees are specified, enforcement is absent.¹⁸

Enforcement powers do exist. The Environment Act 2021 removed the previous £250,000 cap on civil penalties for environmental offences. Variable monetary penalties — theoretically unlimited — are available for EPR-related violations committed after 11 December 2023.²⁰ These provisions sit in primary legislation and ministerial announcements, not in the operational guidance that a producer's compliance team actually reads.

No published data exists on the number of civil penalties imposed on producers for packaging non-compliance under EPR. No published data on unregistered "free rider" producers identified. No published data on fees owed versus fees collected.²⁰

In Year 1, EPR generated a £63 million shortfall after producers resubmitted their packaging data with revised — lower — tonnage figures. The UK government stepped in to cover the gap.²¹ PackUK, the scheme administrator, acknowledged "data control deficiencies" in its operational plan.²¹

The system is new. Year 1 shortfalls occur in any compliance regime. PackUK has announced stronger data controls for Year 2, with a recovery target of £1.56 billion and structured recalculation windows.²¹ The trajectory may be toward tighter accountability. EPR may mature into a robust enforcement framework. Year 1 does not define Year 10.

But here is the structural observation, which does not depend on Year 1 or Year 10:

The consumer encounters their penalties in the same framework that defines their obligations. Section 46 creates the duty. Section 46A creates the penalty. Same Act. Same document. The connection between obligation and consequence is visible, physical, local — an officer at your bin, a notice at your door.

The producer encounters their fees in one document and their penalty powers — if they encounter them at all — in a different Act, administered by a different body, with no published record of exercise. The obligation is in the EPR guidance. The consequence is in the Environment Act. The enforcement is in neither.

Different types of obligation warrant different types of enforcement. Household waste compliance is a physical behaviour — someone sorting objects at a bin. Producer compliance is a financial obligation — a company reporting data and paying fees. Nobody argues these should use identical mechanisms.²²

The question is not whether the mechanisms are different. The question is why only one is visible.

The Quiz

Consider, then, both halves of the system at once. A consumer chooses a compostable cup — pays more for it, because the label says it will decompose. The legislation sends that cup to a landfill where it will persist for a century. No authority checked whether the certification and the waste system were compatible. No penalty exists for the producer who labelled a material "compostable" and placed it into a system with no composting pathway. The penalty exists for the consumer who, confused by the label, puts the cup in the wrong bin.

This is the architecture. Not a flaw in an otherwise functional system. An architecture in which the consumer bears the cognitive load and the consequences, while the producer bears a fee.

And the cognitive load is not trivial.

Eighty-one per cent of UK citizens put non-recyclable items in their recycling bins.²³ Only 9% feel "very confident" about what can and cannot be recycled.²³ Contamination rates have risen six percentage points since 2017, despite continuous public education campaigns.²³ Working memory holds 3-5 items when chunking is restricted.²⁴ Schedule 1 contains at least 30 classification decisions — including items that require material-science knowledge to identify. Part 5 excludes fibre-based composite packaging "where the non-paper fibre content is more than 15% by weight."¹ The system asks consumers to perform a cognitive task that exceeds human working memory by a factor of six to ten — and then provides a penalty framework for the inevitable failures.

England's household recycling rate: approximately 44% in 2023-24. It has been approximately 44% since 2013.²⁵ A decade of consumer-facing complexity. A decade of stagnation.

The Levers

The gap this report identifies emerges where independently valid instruments collide — a certification and a waste regulation that were never checked for compatibility. Closing it would require:

An intersection authority. A body tasked with checking whether regulatory instruments from different domains produce compatible outcomes when applied to the same material. EN 13432 certifies a capability. The Separation of Waste Regulations determine a destination. No current authority is responsible for checking whether the capability can be activated at the destination. This gap is not unique to compostable packaging — it recurs wherever certification standards and waste regulations share jurisdiction over the same product without coordination.

Composting infrastructure that matches certification conditions. EN 13432 certifies PLA at 58°C under aerobic industrial composting conditions. The infrastructure to provide those conditions at scale — separate collection of compostable packaging, routing to industrial composting rather than AD — barely exists (24 certified sites, approximately 30,000 tonnes capacity).¹⁵ Until infrastructure matches certification, the word "compostable" describes a capability that the consumer cannot access.

Published producer compliance data. Consumer contamination is measured (81%), tracked (WRAP Recycling Tracker), and reported annually.²³ Producer compliance — registration rates, fee collection rates, enforcement actions, free-rider identification — is not published. Symmetry of accountability requires symmetry of transparency.

Fee structures that address packaging design, not only material type. The RAG rating system begins this work — but a 1.2x fee multiplier for unrecyclable packaging in Year 2 is a price signal, not a prohibition.¹⁹ Forty-five per cent of plastic packaging is rated Red. The fee for producing unrecyclable packaging is a surcharge. The fee for incorrectly sorting it is a penalty.

What Would Change This Analysis

This analysis identifies a structural gap between compostable certification and waste legislation. Several developments would narrow or close it:

If UK industrial composting infrastructure expanded to accept compostable packaging at scale — with separate collection, processing at EN 13432's specified temperatures, and capacity beyond the current 30,000 tonnes — the dead end would have a viable exit. The gap is in infrastructure, not in material science; the certification works at the right temperature.

If any UK council routes separated food waste to industrial composting rather than anaerobic digestion, the caddy liner pathway would function as intended for that council's residents. This analysis could not confirm whether such councils exist — if they do, the dead end has escape routes that this report does not account for.

If the Environment Agency publishes enforcement data on EPR producer compliance — actions taken, penalties imposed, free riders identified — the enforcement visibility asymmetry narrows. The powers exist in law. Published data on their exercise would change the "invisible" characterisation.

If EPR fee modulation at maturity (Year 4, 2.0x multiplier for Red-rated packaging) demonstrably shifts producer behaviour toward recyclable formats, the price signal may prove more effective than the penalty mechanism. This report assesses Year 1. Year 4 may tell a different story.

If DEFRA or its advisory bodies produce a cross-instrument compatibility review — assessing whether EN 13432 certification, Separation of Waste regulations, and EPR fee structures produce coherent outcomes when applied to the same materials — the intersection gap would be officially identified, which is the first step toward closing it.

The system has two temperatures. One where the material works. One where it's sent. The gap between them is 18 degrees, and it is nobody's job to notice.