Ready Mixed Concrete: The Three Conditions That Decide Employment Status

You wore the client's badge. You worked to their schedule, used their systems, took direction from their managers—and HMRC says that is what an employee looks like. The surface facts can feel as though they have already decided the case against you.

They have not. In December 1967 the High Court considered a man who drove a lorry painted in a company's colours, wore that company's uniform, and was contractually bound to carry out all reasonable orders "as if he were an employee of the company". It held he was not an employee. That judgment is still the starting point for every employment-status decision a UK tax tribunal makes.

This article explains it: the three conditions MacKenna J laid down, what each one asks, why the third is where your case will almost certainly be decided, and how to run your own arrangement through the same questions.

Why A 1967 National Insurance Case Decides Your Tax Status

There is no statutory definition that settles whether you are employed or self-employed for tax. The line between a contract of service (the legal name for employment) and a contract for services (self-employment) is drawn by the courts, case by case. The case that drew it is Ready Mixed Concrete (South East) Ltd v Minister of Pensions and National Insurance [1968] 2 QB 497—"RMC" for short.

It arrived not as an employment-rights claim but as a National Insurance appeal. The Minister had determined that Thomas Latimer was an "employed person" under the National Insurance Act 1965 for the week beginning 8 November 1965, making the company liable for a flat-rate contribution. The company appealed by case stated, putting the legal question to the High Court. Status has always been a tax-and-NIC question first; the employment-rights world borrowed this test, not the other way round.

The modern descendant of that determination is an officer's decision under section 8(1)(a) of the Social Security Contributions (Transfer of Functions, etc.) Act 1999 on whether a person is an earner and in which category—appealable to the First-tier Tribunal under section 11.

You meet the RMC framework wherever status is disputed today: in an IR35 or off-payroll enquiry, where the hypothetical contract is tested against these very conditions; in PAYE status disputes; in Construction Industry Scheme characterisation challenges; and in National Insurance status decisions. HMRC's own Employment Status Manual and its CEST tool are built on this framework, not a replacement for it.

The stakes are real. Losing a status dispute can mean backdated tax and National Insurance, plus interest and, potentially, penalties on top.

The Owner-Driver In Company Colours

Thomas Latimer worked as a batcher at Ready Mixed Concrete's yard, making the concrete rather than delivering it. The company wanted those two businesses kept separate, so in 1963 he became an owner-driver under its new delivery scheme. In May 1965 he signed a fresh contract and, a month later, took a new Leyland lorry on hire-purchase from a company in the same group.

Look at the arrangement from one side and he was an employee in everything but name. The lorry was painted in the company's colours and carried its signs and its mixing unit, which remained company property. He had to wear the company's uniform and carry out all reasonable orders from any competent servant of the company "as if he were an employee of the company". He could not work as a haulier for anyone else, and reading clauses 10 and 12 of his contract together, he had to drive the lorry himself whenever the company required it.

Now look from the other side. He owned the lorry (on hire-purchase). He had to keep it "washed, cleansed, oiled, greased, maintained and in good and substantial repair"—all at his own expense. He was paid "8s. 6d. per cubic yard for the first radial mile and 1s. 1d. per cubic yard for each mile thereafter"—by quantity delivered and distance covered, not by the hour. He could, with the company's consent, put a competent driver in his place. And he could buy his fuel wherever he liked.

MacKenna J held this was not a contract of service but a contract of carriage: Latimer was, in the judge's words, a "small business man", running a delivery business whose assets, costs and rewards were his own. Two other owner-drivers' cases stood or fell with Latimer's, and the company's appeal was allowed with costs. There is a quiet irony in that: the case that built the structure every worker now argues within is one the worker lost.

MacKenna J's Three Conditions

The tribunal deciding your case will start from this passage, at page 515 of the report. MacKenna J said:

"A contract of service exists if these three conditions are fulfilled. (i) The servant agrees that, in consideration of a wage or other remuneration, he will provide his own work and skill in the performance of some service for his master. (ii) He agrees, expressly or impliedly, that in the performance of that service he will be subject to the other's control in a sufficient degree to make that other master. (iii) The other provisions of the contract are consistent with its being a contract of service."

Take them one at a time.

Condition (i): Your Own Work And Skill, For A Wage

The first condition is the wage-work bargain: there must be payment, and you must be obliged to do the work personally. You will also see it called mutuality of obligation—if HMRC's letter uses that phrase, this is the condition it means. MacKenna J spelled out what breaks it: "Freedom to do a job either by one's own hands or by another's is inconsistent with a contract of service, though a limited or occasional power of delegation may not be".

Notice the two halves. An unrestricted freedom to do the job yourself or send someone else is inconsistent with employment; a limited or occasional power of delegation may not be. That distinction is what governs substitution clauses like Latimer's—there is a section on it below.

Condition (ii): Control Is A Right, Not A Running Commentary

The second condition is control, and MacKenna J defined it on the same page:

"Control includes the power of deciding the thing to be done, the way in which it shall be done, the means to be employed in doing it, the time when and the place where it shall be done. All these aspects of control must be considered in deciding whether the right exists in a sufficient degree to make one party the master and the other his servant. The right need not be unrestricted."

Four dimensions: what is to be done, how, by what means, and when and where. But notice what the question is not. It is not whether anyone actually stood over you giving directions; it is whether the right of control exists in a sufficient degree. And MacKenna J said where to find it: "To find where the right resides one must look first to the express terms of the contract, and if they deal fully with the matter one may look no further."

That framing matters for skilled work. Nobody can supervise a surgeon mid-operation or a referee mid-match. Yet either can still sit within what the Supreme Court in PGMOL endorsed, adopting an earlier judge's phrase, as a "sufficient framework of control" (para 66): contractual rights over conduct and performance, backed by enforceable sanctions.

Condition (iii): Nothing Else Inconsistent

The third condition is different in kind: negative and open-ended. Are the other provisions of the contract consistent with employment? MacKenna J called it "for my purpose the important one", and explained it through five worked examples of provisions inconsistent with a contract of service.

This third stage is where everything else gets weighed: who owns the equipment, who bears the financial risk, who keeps the profit good management creates, how the worker is paid, how the business is run. How a tribunal performs that weighing—standing back and painting a picture from the accumulated detail—is the territory of Hall v Lorimer.

Then comes the sentence that carries the whole case: "An obligation to do work subject to the other party's control is a necessary, though not always a sufficient, condition of a contract of service." Control gets HMRC through the door; it does not win the case. The logic runs both ways: satisfying conditions (i) and (ii) does not make you an employee, and conceding control does not sink an appeal that is strong at stage three.

Why Latimer Was Not An Employee

The second of MacKenna J's five examples is the case in a nutshell:

"A contract obliges one party to carry another's goods, providing at his own expense everything needed for performance. This is not a contract of service, even though the carrier may be obliged to drive the vehicle himself and to accept the other's control over his performance: it is a contract of carriage."

Substitute concrete for goods and the example decides the case. The judgment applied it to Latimer's obligations directly:

"He must do all this, at his own expense, being paid a rate per mile for the quantity which he delivers. These are obligations more consistent, I think, with a contract of carriage than with one of service. The ownership of the assets, the chance of profit and the risk of loss in the business of carriage are his and not the company's."

His freedoms did the lighter work: he could maintain the lorry himself or pay someone else; use another driver when ill or on holiday, or whenever he had not been directed to drive himself; and buy fuel and supplies where he liked, though the company had a say over major repairs. That, MacKenna J concluded, was enough. A person does not stop running their own business merely by agreeing to run it efficiently, or to accept another's oversight.

Do not over-read the lesson, though. The colours, the uniform and the obedience clause were real, and all pointed towards employment; they were not irrelevant, they were outweighed. What saved Latimer was that the business risk was his: he owned the asset, paid its running costs, was paid by results, bore the risk of loss and kept the chance of profit.

The mirror image arrived less than a year later. In Market Investigations Ltd v Minister of Social Security [1969] 2 QB 173, a part-time market-research interviewer—no equipment of her own, no capital at risk, no way to grow a profit through her own management—was held an employee under the same framework, and the case gave the third stage its most enduring formulation: is this person in business on their own account? A lorry and a clipboard, decided months apart, opposite outcomes, one test: what matters is where the business risk and reward sit. There is no free transcript of Market Investigations online, but HMRC's own summary of it is at ESM7040.

What The Courts Did With The Test

Nearly sixty years on, RMC's authority has only grown. Lord Clarke in Autoclenz Ltd v Belcher [2011] UKSC 41 called MacKenna J's passage "the classic description of a contract of employment"—an endorsement the Supreme Court itself records in PGMOL at para 28.

In HMRC v Atholl House Productions Ltd [2022] EWCA Civ 501, the Court of Appeal closed down a long-running argument that RMC and the Hall v Lorimer line of cases were rival tests (para 122):

"It is wrong to treat RMC and the line of cases including Hall v Lorimer as representing two separate tests... In other words, they are both multi-factorial in their approach."

Then the Supreme Court in PGMOL (2024) treated RMC as "the starting point" (para 28), quoted the three conditions verbatim from p 515 (para 37), and treated conditions (i) and (ii) as threshold requirements—"the irreducible minimum of mutuality of obligation and control" (para 91). Having found both satisfied, it did something telling: it declined to decide the case itself and remitted stage three to the First-tier Tribunal.

In the same vein, the Upper Tribunal in HMRC v S & L Barnes Ltd [2024] UKUT 262 (TCC) re-made a status decision at the third stage, in a judgment HMRC's own manual now quotes for the instruction to "zoom out from the contract in issue".

The proof landed on 1 May 2026. On the remittal, in Professional Game Match Officials Ltd v HMRC [2026] UKFTT 654 (TC), the First-tier Tribunal worked through stage three and allowed PGMOL's appeal. Both threshold conditions were met; the case turned—and was won—at condition (iii). That is where employment-status cases are actually decided.

Substitution, And Why Your Written Contract Matters More In Tax

Latimer's clause 10 let him, with the company's consent, appoint a competent driver in his place; clause 12 let the company require him to drive himself. Read together, that is a limited power of delegation—the kind MacKenna J said may not be inconsistent with employment. It did not by itself take Latimer out of a contract of service; his case was won on ownership, risk and reward.

Contrast Express & Echo Publications Ltd v Tanton [1999] EWCA Civ 949. Mr Tanton could send a substitute whenever he was unwilling to drive, the clause was not a sham, and it had genuinely been used. Personal service was absent, so the contract could not be one of service at all. Peter Gibson LJ set the two clauses side by side: consent-based and conditional in RMC, unfettered and real in Tanton.

So a genuine, unfettered right to substitute is one of the strongest pointers against employment—but tribunals look at whether the right is real and whether it has ever been usable in practice.

An unexercised right still counts. As the Court of Appeal put it in Atholl House (para 159), quoting Lord Clarke: "If a contractual right, as for example a right to substitute, exists, it does not matter that it is not used." That cuts both ways: an unused right of control still counts at condition (ii), and an unused right to substitute still counts at condition (i).

Now the tax point. In employment-rights cases, Autoclenz lets a tribunal, in some circumstances, look past written terms that do not reflect what was truly agreed. In Atholl House (paras 156-160) the Court of Appeal held that route is not available in the income tax context, and HMRC's guidance at ESM0560 says the same.

That is not to say the paperwork is unchallengeable: ordinary principles of contractual interpretation still apply, including whether the written terms genuinely record what was agreed. But the practical consequence is plain—in a tax status dispute your written contract carries more weight than many readers expect, so read it before the tribunal does.

Running Your Arrangement Through The Three Conditions

One thing first: the test is direction-neutral. Most readers want self-employment confirmed; some need the opposite. The three conditions ask the same questions whichever side of the line you need to be on. Work down MacKenna J's list.

Condition (i)—personal service. Are you obliged to do the work yourself? What does the contract actually say about substitution—consent required, equivalent skills, at whose cost? Have you ever used the right? A conditional clause like Latimer's will not usually settle the question on its own; an unfettered, genuinely usable one can.

Condition (ii)—the right of control. List every right the contract gives the other party over what you do, how, by what means, and when and where. Rights, not day-to-day practice: the tribunal looks first to the express terms. Evidence of how things actually worked still matters, but its main home is stage three.

Condition (iii)—the business question. This is where your evidence earns its keep: what equipment or assets you provide and who pays to maintain them; how you are paid—by time, or by output and results; what financial risk you carry (fixed-price work, correcting defects at your own cost, bad debts, unpaid gaps between engagements); what chance of profit your own management creates; how many clients you have; and the paper trail of a business—invoices, accounts, insurance, marketing, contemporaneous records. For how the tribunal weighs it all, see the Hall v Lorimer analysis.

If the years in dispute are behind you, expect to reconstruct that evidence rather than find it in a folder. Bank statements can prove what you spent on tools, insurance and subscriptions; invoicing records show multiple payers; old calendars, emails and messages show how work was offered and whether you ever turned any down; marketing material and old versions of your website show you holding yourself out as a business. Records made at the time, for another purpose, are worth far more than anything written up now for the appeal. And ask the person who actually engaged you for a witness statement early, while memories are fresh—our hearing preparation guide covers how.

These are the questions the tribunal asks. How they come out depends entirely on your own facts. If you appeal, frame your grounds of appeal around the three conditions—it is the structure the tribunal will apply.

And aim to win first time. Status is an evaluative conclusion drawn from found facts, so an onward appeal needs an error of law in the Edwards v Bairstow sense, not a different view of the weighing. The First-tier Tribunal hearing is, realistically, your best chance.

Costs should not be what stops you. The 1967 appeal ended "with costs", but that was the High Court: in the First-tier Tribunal the default is that each side bears its own costs whatever the outcome. The main exceptions are a case allocated to the Complex category, where you can opt out of costs-shifting within 28 days, and costs awarded for unreasonable conduct—our tracks and costs guide explains both.

Finally, the deadlines. A status challenge can arrive as more than one decision—a status determination, a PAYE determination, a National Insurance decision—each with its own appeal clock, generally 30 days from the date of the decision. Check who each decision is addressed to as well as what it says: in an off-payroll (Chapter 10) case the party assessed is usually the client or the agency, not the worker, and the worker's route runs through the client-led disagreement process instead. Our IR35 and off-payroll appeals guide sets out who can appeal what; if in doubt, take advice.

Before committing to the tribunal, you can also ask HMRC for a free statutory review by an officer not previously involved in your case. It costs nothing and does not close off the tribunal afterwards. And appealing does not by itself stop the tax becoming payable: where a PAYE determination is in issue, you can apply to postpone the disputed tax while the appeal runs.

Whatever you do, do not let a deadline pass in silence. An unappealed decision becomes final, and the tax and National Insurance on it become collectible whatever the merits of your status argument. A late appeal is possible, but it is discretionary and gets harder the longer you leave it. Our guides to understanding your appeal rights and how to appeal to the tax tribunal cover the mechanics.

Key Legislation And Resources

The Judgment

• Ready Mixed Concrete (South East) Ltd v Minister of Pensions and National Insurance [1968] 2 QB 497 — Queen's Bench Division, MacKenna J, 8 December 1967

Legislation

• National Insurance Act 1965 — the Act under which the Minister determined Latimer was an "employed person" (now almost entirely repealed)
• Section 8, Social Security Contributions (Transfer of Functions, etc.) Act 1999 — the modern officer's decision on whether a person is an earner and in which category
• Section 11, Social Security Contributions (Transfer of Functions, etc.) Act 1999 — appeal against a section 8 decision to the First-tier Tribunal

Key Cases

• Ready Mixed Concrete (South East) Ltd v Minister of Pensions and National Insurance [1968] 2 QB 497 — the three conditions; control necessary but not always sufficient; the owner-driver held a "small business man"
• HMRC v Professional Game Match Officials Ltd [2024] UKSC 29 — the Supreme Court's modern restatement; RMC as "the starting point"; conditions (i) and (ii) as the irreducible minimum
• Professional Game Match Officials Ltd v HMRC [2026] UKFTT 654 (TC) — the remittal: both thresholds satisfied, and the case decided (and won) at stage three
• HMRC v Atholl House Productions Ltd [2022] EWCA Civ 501 — one multi-factorial framework, not two rival tests; the Autoclenz route unavailable in the income tax context
• Autoclenz Ltd v Belcher [2011] UKSC 41 — the "classic description" endorsement; the employment-rights approach to written terms
• Express & Echo Publications Ltd v Tanton [1999] EWCA Civ 949 — a genuine, unfettered substitution right defeats personal service
• Hall (Inspector of Taxes) v Lorimer [1993] EWCA Civ 25 — how to do the stage-three weighing: paint a picture from the accumulation of detail
• HMRC v S & L Barnes Ltd [2024] UKUT 262 (TCC) — a worked example of the third stage; "zoom out from the contract in issue"

HMRC Guidance

• ESM7030 — Case Law: Ready Mixed Concrete — HMRC's own summary of the case
• ESM7040 — Case Law: Market Investigations — HMRC's summary of the mirror-image case, which has no free transcript online
• ESM0560 — the evaluative exercise at the third stage — HMRC's post-PGMOL guidance on stage three, including the position on Autoclenz in tax
• ESM0516 — control — the sufficient-degree-of-control pre-condition
• ESM0531 — personal service — condition (i) and the delegation caveat
• Check Employment Status for Tax (CEST) — HMRC's online tool, built on the case-law framework; not binding on a tribunal

On This Site

• PGMOL v HMRC: employment status — full analysis of the modern restatement and the remittal
• Hall v Lorimer: painting the whole picture — the stage-three weighing exercise in depth
• IR35 off-payroll appeals — the regime where the three conditions do most of their modern work
• CIS appeals — employed-versus-self-employed characterisation in construction
• National Insurance when working abroad — the NIC side of status, including section 8 decisions
• Employment income appeals — what turns on being an employee: expenses, benefits, PAYE
• Interest on unpaid tax — what a backdated status bill accrues on top of the tax and NIC
• Reducing HMRC penalties — the Schedule 24 penalty that can ride on a reclassification
• Edwards v Bairstow: error of law — why an evaluative status finding is hard to disturb on appeal
• Writing grounds of appeal — structuring your grounds around the three conditions
• How to appeal to the tax tribunal — the 30 days deadline and filing mechanics
• HMRC internal review — the free statutory review before you commit to the tribunal
• Postponing payment during appeal — whether the disputed tax must be paid while the case runs
• Tribunal tracks and costs — the no-costs default, the Complex category and the 28-day opt-out
• Late appeal to the tax tribunal — if a deadline has already passed
• Preparing for your tax tribunal hearing — bundles, witness statements and reconstructing evidence
• Understanding HMRC appeal rights — the appealable-decision map
• Tax dispute timeline — where a status dispute sits in the wider journey

This article is for informational purposes only and does not constitute legal or tax advice. For advice specific to your situation, consult a qualified tax adviser, accountant, or solicitor.