Introduction to Defences in Negligence

In the previous chapters, we looked at how a claimant (the person suing) proves that a defendant was negligent. But what happens if the defendant has an excuse? In Law, these excuses are called defences.

Even if a defendant breached their duty of care and caused damage, they might not have to pay the full amount of compensation—or any at all—if they can show that the claimant was also responsible or knew what they were getting into. In this chapter, we will focus on the two main defences required for your Paper 2 exam: volenti non fit injuria (consent) and contributory negligence.

Note: These defences are vital for the "Market" section of your course because they often arise in business, employment, and consumer accidents.

The phrase volenti non fit injuria is Latin for "to a willing person, no injury is done." We usually just call this the defence of consent.

This is a complete defence. This means that if the defendant successfully proves it, the claimant receives zero money in damages. The defendant is completely cleared of the need to pay compensation.

How does a defendant prove Consent?

To use this defence, the defendant must show three things:

1. The claimant had full knowledge of the nature and extent of the risk.
2. The claimant exercised free choice (they weren't forced into the situation).
3. The claimant voluntarily accepted the risk of harm.

A simple analogy: Imagine you decide to join a "tomato throwing" festival. You know there is a risk you will get hit in the eye and stained with juice. If you get hit, you cannot sue the person who threw the tomato because you consented to that specific risk by joining the event.

Important Limitations

Don't worry if this seems broad; the courts are actually quite strict about when this defence can be used:

Scientific Knowledge: Just knowing a risk exists isn't enough. The claimant must truly understand the danger. For example, a factory worker might know a machine is loud, but that doesn't mean they consent to going deaf if the employer fails to provide ear protection.

Free Will: If someone is forced into a risk (like a worker told by their boss "do this dangerous task or you're fired"), the defence of volenti usually fails because the choice wasn't truly "free."

Rescuers: The law is very kind to heroes. If a person is injured while trying to rescue someone in an emergency, the courts almost never say they "consented" to the risk. The law doesn't want to discourage people from helping others.

Key Takeaway: Consent is an "all or nothing" defence. It is hard to prove because the defendant must show the claimant actively chose to take the specific risk that caused the injury.

2. Contributory Negligence

Unlike consent, contributory negligence is a partial defence. This means it doesn't stop the defendant from being liable; instead, it reduces the amount of money (damages) the defendant has to pay.

This defence is governed by the Law Reform (Contributory Negligence) Act 1945. This Act allows the court to look at the accident and decide what percentage of the blame lies with the claimant.

How it works

The defendant must prove that the claimant failed to take reasonable care for their own safety and that this failure contributed to their injuries.

The court uses an objective test: Would a reasonable person have acted more carefully to avoid being hurt?

Common Examples:
- Car accidents: If a claimant is injured in a crash but wasn't wearing a seatbelt, they didn't cause the crash, but they made their own injuries worse. The court might reduce their compensation by \(25\%\).
- Workplace: If a worker is injured by a machine but was ignoring safety signs or not wearing a provided helmet, their damages will be reduced.

The "Reduction" Process

1. The court first decides the total amount of money the injury is "worth" (e.g., \(\$10,000\)).
2. The court then decides how much the claimant was to blame (e.g., \(20\%\) to blame).
3. The court subtracts that percentage from the total: \(\$10,000 - 20\% = \$8,000\).
4. The claimant receives \(\$8,000\).

Quick Review: Which is better for a defendant? Volenti (Consent) is better because they pay \(\$0\). However, Contributory Negligence is much easier to prove in court.

3. Comparing the Two Defences

To help you in your Paper 2 scenarios, use this quick comparison table:

Defence: Volenti non fit injuria (Consent)
Type: Complete Defence (Total victory for defendant).
Claimant's Mindset: They knew the risk and specifically agreed to it.
Result: Damages are reduced to zero (\(0\%\) payout).
Statute: Based on common law principles.

Defence: Contributory Negligence
Type: Partial Defence.
Claimant's Mindset: They were careless or "stupid" regarding their own safety.
Result: Damages are reduced by a percentage (e.g., \(10\%\) to \(75\%\)).
Statute: Law Reform (Contributory Negligence) Act 1945.

4. Exam Tips: Assessing the Scenario

In Paper 2, you will be given a story (a scenario) and asked to evaluate the legal position. When looking for defences, ask yourself these questions:

Step 1: Did the claimant do something careless?
If they forgot their seatbelt, ignored a warning sign, or stepped into a busy road without looking, start talking about contributory negligence and the 1945 Act.

Step 2: Did the claimant actually agree to the danger?
If they were doing something like extreme sports or knowingly getting into a car with a driver who was visibly drunk, consider volenti (consent).

Common Mistake to Avoid: Don't just say "the claimant was at fault." You must use the specific legal terms. Say: "The defendant may raise the partial defence of contributory negligence under the Law Reform (Contributory Negligence) Act 1945."

Did you know?
The Law Reform (Contributory Negligence) Act 1945 is also used in contract law (specifically for misrepresentation). If a person relies on a false statement but was also careless in checking the facts themselves, the court can reduce their damages using this same Act!

Summary Checklist

- Consent (Volenti): Complete defence; requires knowledge, free will, and voluntary acceptance.
- Contributory Negligence: Partial defence; reduces damages based on the claimant's share of the blame.
- 1945 Act: The key piece of legislation for contributory negligence.
- Reasonable Person Test: The standard used to see if the claimant was careless.