When someone is injured at work or by a worker, the employer often ends up in the frame. That is because employers face two types of liability: their own direct duty to keep employees safe (primary liability), and liability for things their employees do wrong while working (vicarious liability). Both routes lead to the employer's door, but they operate on completely different principles. You need to understand the difference and know when each applies.
Employers' liability questions often involve a fact pattern where you need to distinguish between primary liability (the employer breached their own duty) and vicarious liability (the employer is liable for an employee's tort). Start by asking: who did the wrong thing, and was it the employer personally or an employee? Then apply the correct framework.
An employer has a direct, personal duty of care towards their employees. This is not about what the employee did wrong — it is about what the employer failed to do. If the employer breaches this duty and an employee is injured as a result, the employer is directly liable in negligence. The leading authority is Wilsons and Clyde Coal Co v English [1938].
In Wilsons and Clyde Coal Co v English [1938], the House of Lords established that every employer owes three duties to their employees. Think of it as the employer's personal checklist for keeping staff safe. The duty is one of reasonable care, not strict liability — the employer does not guarantee safety, but must take reasonable steps to achieve it.
The employer's duty is judged by the ordinary standard of reasonable care. This means the employer is not an insurer of their employees' safety. They need only take steps that a reasonable employer would take in the circumstances. The test considers factors like the likelihood and seriousness of harm, the cost of precautions, and common industry practice. An employer who does everything reasonable will not be liable even if an accident still happens.
The employer's primary duty is the same reasonable person standard from general negligence (Blyth v Birmingham Waterworks). The only difference is the context — you are asking what a reasonable employer would have done, considering the three specific duties from Wilsons and Clyde Coal Co.
Most employers are legally required to hold employers' liability insurance. The Employers' Liability (Compulsory Insurance) Act 1969 (EL(CI)A 1969) ensures that employees who are injured at work have a solvent defendant to claim against. Without compulsory insurance, an employer who caused a serious injury through negligence might not have the funds to pay compensation, leaving the injured worker with no practical remedy.
The compulsory insurance requirement exists to protect employees, not employers. An uninsured employer is still fully liable for any negligence — the insurance just ensures there is money available to pay compensation. In practice, this means you should always check that insurance is in place when advising an injured employee.
Vicarious liability means the employer is held liable for torts committed by their employees during the course of employment — even though the employer did nothing wrong personally. It is a form of strict liability in the sense that the claimant does not need to prove the employer was at fault. The rationale is that the employer puts the employee in a position to cause harm and profits from their work, so the employer should bear the cost.
To establish vicarious liability, you need to satisfy two questions. First, was the person who committed the tort an employee (or in a relationship akin to employment)? Second, was the tort committed in the course of employment? Both must be answered in the affirmative. The Supreme Court confirmed this two-stage approach in Various Incidences of the Crown v Arnaud [2021].
In Various Incidences of the Crown v Arnaud [2021], the Supreme Court confirmed that the two-stage test remains the correct approach. The case involved a soldier who sexually assaulted a fellow service member. The Court held that while the relationship question was clearly satisfied (the soldier was in the armed forces), the assault was not sufficiently connected to his employment. This case is important because it shows that being an employee is necessary but not sufficient — the course of employment requirement still acts as a limit.
Remember the justifications: (1) the employer controls the employee's work and can prevent harm, (2) the employer profits from the employee's activities, (3) the employer is better able to absorb and insure against the cost, and (4) vicarious liability incentivises employers to select, train, and supervise staff carefully.
The first stage of vicarious liability asks whether the tortfeasor is an employee. If they are an independent contractor, the employer is generally not vicariously liable. Getting this right is crucial because it determines whether the claim proceeds against the employer or only against the individual who caused the harm — who may not have the funds to pay compensation.
The classic test for distinguishing employees from independent contractors comes from Ready Mixed Concrete (South East) Ltd v Minister of Pensions [1968]. MacKenna J set out multiple factors, but the central question is one of control: does the employer control not just what the worker does, but how they do it? An employee is subject to the employer's control over the manner of work, while an independent contractor controls how they carry out the task.
Modern vicarious liability law recognises two categories of relationship that can satisfy the first stage. Limb (a) covers traditional employees under a contract of employment. Limb (b), established in Barclays Bank v Various Claimants [2020], extends vicarious liability to workers whose relationship with the defendant is sufficiently akin to employment, even if there is no formal contract of service.
If the tortfeasor has a contract of employment with the defendant, the relationship question is straightforwardly satisfied. You apply the ordinary tests for employment status — control, personal service, mutuality of obligation, and the other factors from Ready Mixed Concrete. Most exam questions will involve an obvious employee in this category, such as a shop assistant, delivery driver, or care worker.
Barclays Bank v Various Claimants [2020] is the key case for limb (b). The Supreme Court held that a doctor engaged by Barclays to carry out pre-employment medical assessments was in a relationship sufficiently akin to employment for vicarious liability purposes, even though she was technically an independent contractor. The Court focused on five factors: (1) the employer was more likely to have the means to insure against the risk, (2) the tort was closely connected to the role assigned by the employer, (3) the employer's business was likely to have created the risk, (4) the employee was acting in the employer's interest rather than their own, and (5) the employer had control over the employee's role.
| Case | Facts | Holding |
|---|---|---|
| Ready Mixed Concrete v Minister of Pensions [1968] | Lorry driver engaged to deliver concrete under a complex agreement. | Set out the multi-factor test. Emphasis on control — the employer must control not just what is done but how it is done. |
| Barclays Bank v Various Claimants [2020] | Doctor carried out pre-employment medicals for the bank as an independent contractor. | Extended vicarious liability to limb (b) — relationships sufficiently akin to employment. The bank was vicariously liable for the doctor's sexual assault. |
| Lister v Hesley Hall [2002] | Warden at a boarding school sexually abused pupils over many years. | Relationship question satisfied even though the warden was employed by a company running the school. The school's proprietor was vicariously liable. |
The general rule is that an employer is not vicariously liable for torts committed by independent contractors. This is a fundamental distinction. However, limb (b) from Barclays Bank blurs the line in some cases. On the exam, if the facts show someone running their own business with significant autonomy, they are likely an independent contractor and vicarious liability will not apply.
Even if you establish that the tortfeasor is an employee, you still need to show the tort was committed in the course of employment. This is often the harder question in practice. An employee who is on a "frolic of their own" — pursuing purely personal goals unconnected with work — takes themselves outside the course of employment, and the employer is not liable.
The traditional approach comes from Salmond's Law of Torts. Under the Salmond test, an employee acts in the course of employment if: (a) they are doing what they were employed to do (an authorised act), or (b) they are doing an authorised act in an unauthorised way. The key insight is that even if the employee goes about the job in the wrong way, the employer may still be liable. It is only when the employee departs from their job entirely that the employer escapes liability.
The modern approach replaces the Salmond test with a broader "close connection" test, established by the House of Lords in Lister v Hesley Hall [2002]. The question is whether there is a sufficiently close connection between the employee's position and their wrongful conduct to make it fair and just to hold the employer liable. This test is more flexible and focuses on the relationship between the job and the tort rather than whether the specific act was authorised.
Think of it this way: the Salmond test asks "was this authorised?" while the close connection test asks "is this sufficiently related to the job?" The close connection test is wider — it can capture situations where the act itself was not authorised, but it was closely connected to the role the employee was placed in. For the SQE, use the close connection test unless the facts clearly point to a frolic.
In Rose v Plenty, a milkman employed by a dairy was expressly forbidden from taking children on his milk float. Despite this, he allowed a 13-year-old boy to help him and gave him a ride. The boy was injured when the float overturned. The Court of Appeal held that the milkman was still acting in the course of employment because he was doing his job (delivering milk) even though he had disobeyed instructions. The deviation from instructions was not enough to take him outside the course of employment.
In Mattis v Pollock, a pub owner employed a bouncer who had a violent temperament and previous convictions. The bouncer violently ejected a customer, causing him fatal head injuries. The Court of Appeal held that the bouncer was acting in the course of employment. Ejecting troublesome customers was part of his job. The fact that he used excessive force was an unauthorised way of doing an authorised act — exactly what the Salmond test captures, and the close connection test also supports.
Bellman v Northampton Recruitment is a tricky case. After a work Christmas party, the managing director continued drinking with senior staff at a hotel. He then assaulted a colleague in a discussion about work performance. The Court of Appeal held that the managing director was not acting in the course of employment. The after-work drinks were a social event, and although work was discussed, the assault was not sufficiently connected to his employment role. This shows the limits of vicarious liability — social events do not automatically keep employees within the course of employment.
Various Incidences of the Crown v Arnaud [2021] involved a soldier who sexually assaulted a fellow soldier at a barracks. The Supreme Court held that the Ministry of Defence was not vicariously liable. Although the relationship question was clearly satisfied (the soldier was in the armed forces), the assault was not sufficiently connected to his military duties. Being a soldier did not create the risk of sexual assault in the way that being a warden at a boarding school created the risk of abuse in Lister v Hesley Hall.
| Case | Facts | Course of Employment? | Reasoning |
|---|---|---|---|
| Lister v Hesley Hall [2002] | Warden at a boarding school sexually abused pupils. | Yes | Close connection: the warden's role gave him the opportunity and proximity to commit abuse. |
| Rose v Plenty [1976] | Milkman disobeyed instructions by letting a child ride on his float. | Yes | Still doing his job (delivering milk). Deviation from instructions does not break the connection. |
| Mattis v Pollock [2003] | Bouncer used excessive force ejecting a customer. | Yes | Ejecting customers was his job. Excessive force was an unauthorised way of doing an authorised act. |
| Bellman v Northampton Recruitment [2019] | MD assaulted a colleague at after-work drinks. | No | Social event, not sufficiently connected to employment role despite work being discussed. |
| Arnaud [2021] | Soldier sexually assaulted a fellow soldier at barracks. | No | Being a soldier did not create the risk of sexual assault. Not sufficiently connected to military duties. |
If an employee is on a "frolic of their own" — pursuing purely personal purposes with no connection to their employment — the employer is not vicariously liable. The classic example is an employee who goes on a personal errand using the employer's vehicle during working hours. The further the departure from authorised acts, the more likely it is a frolic. This is the key defence to vicarious liability.
A non-delegable duty is a duty that the employer cannot escape by delegating the work to someone else — typically an independent contractor. If the employer has a non-delegable duty and the contractor causes harm, the employer is liable even though the contractor is not their employee. This is distinct from vicarious liability because it does not depend on the relationship with the contractor — it depends on the nature of the duty itself.
The leading modern case on non-delegable duties is Woodland v Essex County Council [2013]. A school arranged swimming lessons at a public pool operated by a private company. A pupil was seriously injured during a lesson due to the instructor's negligence. The Supreme Court held that the local authority owed a non-delegable duty of care for the pupil's safety during school-arranged activities. The duty could not be delegated to the private contractor running the pool.
Do not confuse these. Vicarious liability depends on the employment relationship — the tortfeasor must be an employee. A non-delegable duty does not depend on who the tortfeasor is — it depends on the nature of the duty owed. If the employer has a non-delegable duty, they are liable even if an independent contractor causes the harm.
There are several ways an employer can avoid or reduce liability. Remember that vicarious liability means the employer steps into the shoes of the employee — so any defence available to the employee is also available to the employer. On top of that, the employer can argue that vicarious liability does not arise at all because the employee was acting outside the course of employment.
The primary defence is that the employee was acting on a frolic of their own — a personal pursuit unconnected to their employment. If the employee has departed so far from their authorised duties that their actions cannot fairly be attributed to the employer, vicarious liability does not arise. The question is one of degree. A minor deviation from instructions (like in Rose v Plenty) does not amount to a frolic, but a completely personal errand might.
A novus actus interveniens (a new intervening act) can break the chain of causation between the employee's tort and the claimant's harm. If something happens after the employee's negligent act that is sufficiently independent and unforeseeable to break the chain, the employer may argue they are not liable for the resulting harm. This is a defence to the negligence claim itself, not specifically to vicarious liability, but it applies equally.
Under the Law Reform (Contributory Negligence) Act 1945, the employer can argue that the claimant contributed to their own injury by failing to take reasonable care for their own safety. This is a partial defence — it does not eliminate liability but reduces the damages by the proportion the court finds just and equitable. The standard of care expected of the claimant is that of a reasonable person in their position.
The fact that the employer breached their duty does not prevent a finding of contributory negligence against the employee. In Jayes v IMI, the employee was injured by machinery. Even though the employer was negligent in failing to guard the machine properly, the employee was also held contributorily negligent because he knew the machine was dangerous but continued to use it without complaint.
| Defence | Effect | Key Points |
|---|---|---|
| Frolic of their own | Complete defence — no vicarious liability | Employee must be acting for purely personal purposes, not connected to employment at all. |
| Novus actus interveniens | Complete defence — breaks chain of causation | An independent, unforeseeable intervening act that supersedes the employee's negligence. |
| Contributory negligence | Partial defence — reduces damages | Claimant failed to take reasonable care for their own safety. Damages reduced proportionately (Law Reform (Contributory Negligence) Act 1945). |
Two key statutes support employers' liability in practice. The Employers' Liability (Defective Equipment) Act 1969 makes it easier for employees to prove negligence when faulty equipment causes injury. The Employers' Liability (Compulsory Insurance) Act 1969 ensures that employers have insurance to meet their liabilities. Both are important for protecting employees and ensuring compensation is available.
Under the Employers' Liability (Defective Equipment) Act 1969, where an employee is injured by defective equipment provided by the employer, it is presumed that the employer was negligent unless they can prove otherwise. The employer is deemed to have the same knowledge as the manufacturer or supplier of the equipment. This reverses the usual burden of proof and makes it much easier for employees to succeed in claims involving faulty machinery, tools, or protective equipment.
As covered earlier, the Employers' Liability (Compulsory Insurance) Act 1969 requires most employers to hold insurance with a minimum level of cover. This is a regulatory measure that ensures employees have a practical remedy. If an employer fails to insure, they commit a criminal offence and may be fined, but they remain fully liable in tort for any negligence. The insurance requirement is there to make sure compensation is actually payable.
| Statute | Purpose | Key Effect |
|---|---|---|
| EL(Defective Equipment) Act 1969 | Helps employees prove negligence for defective equipment | Employer deemed to have manufacturer's knowledge. Burden effectively shifts to employer. |
| EL(Compulsory Insurance) Act 1969 | Ensures employers can pay compensation | Most employers must hold insurance with minimum £5 million cover. Criminal offence to fail. |
| Law Reform (Contributory Negligence) Act 1945 | Allows apportionment of fault | Damages reduced by proportion court finds just and equitable where claimant contributed to harm. |
On the SQE exam, a typical question might involve an injured worker. Your analysis should go: (1) Does the employer have primary liability under Wilsons and Clyde Coal Co? Did they fail to provide competent staff, adequate equipment, or a safe system? (2) If the injury was caused by a fellow employee, is the employer vicariously liable? Apply the two-stage test from Arnaud. (3) What defences are available — frolic, novus actus, contributory negligence? (4) Does a statute like the 1969 Defective Equipment Act help the claimant?
A common exam mistake is to run primary and vicarious liability together as if they are the same thing. They are not. Primary liability is about the employer's own breach of duty. Vicarious liability is about holding the employer responsible for someone else's tort. Always identify which route you are arguing and apply the correct test.
Employers' and vicarious liability is about accountability. Employers who put people to work must answer for the safety of those workers (primary liability) and for the harm those workers cause to others while on the job (vicarious liability). The two-stage test — relationship and course of employment — is your framework for vicarious liability. Non-delegable duties add another layer, ensuring employers cannot escape responsibility by outsourcing. Defences like frolic and contributory negligence provide limits. Together, these rules create a balanced system that protects both employees and third parties.