A liability dispute arises when someone is blamed for loss or injury and a question forms over who is legally responsible and whether an insurance policy will pay. UK liability disputes usually run on two levels at once: the underlying claim about fault between the claimant and the insured, and a separate coverage dispute between the policyholder and its own insurer about whether the policy responds.
Liability insurance — public liability, employers’ liability, product liability and professional indemnity — exists so that a business or professional can meet a claim for damage it causes to others. But buying cover is not the same as being paid. When a serious incident happens, the insurer may dispute whether the claim falls within the policy, whether it was notified correctly, whether an exclusion bites, or how much should be paid and by whom. Those coverage disputes sit on top of the fight over liability itself.
This guide explains both layers in plain English: the main types of cover and when disputes arise; the key concepts — occurrence versus claims-made policies, notification of circumstances, aggregation, the insurer’s right to run the defence, reservation of rights and declinature; third-party rights under the 2010 Act; contribution, subrogation and allocation between insurers; the duty to cooperate; compulsory employers’ liability insurance; and how these disputes resolve — with a worked example in pounds, common mistakes and ten FAQs.
Key takeaways
- A liability insurance dispute has two layers: the underlying liability claim (is the insured at fault?) and the coverage dispute (will the insurer pay?) — and they are governed by different rules and timelines.
- Whether a policy is written on an occurrence or claims-made basis decides which year’s policy responds, which is why late or mis-directed notification is a leading cause of rejected insurance claims.
- Insurers must handle claims fairly and promptly under FCA rules, and an unfair declinature or delay can be challenged through a complaint and, for eligible parties, the Financial Ombudsman Service — the heart of good claims-handling practice.
- Most coverage fights turn on the words of the contract, so a careful policy interpretation of insuring clauses, conditions and exclusions usually decides who is right.
- The Third Parties (Rights against Insurers) Act 2010 lets a claimant pursue an insolvent defendant’s insurer directly, transferring the insured’s policy rights to the injured party.
- Employers’ liability insurance is compulsory under the 1969 Act, with a minimum £5 million of cover and fines of up to £2,500 a day for being uninsured.
- Coverage review, negotiation and mediation are non-reserved services Hayhills delivers directly; declaratory or court proceedings are reserved, so we advise and introduce a regulated solicitor.
In this guide
- What liability insurance is
- The two layers of a dispute
- Occurrence vs claims-made and notification
- Key coverage concepts
- The insurer’s right to run the defence
- Third-party rights against insurers
- Contribution, subrogation and allocation
- The duty to cooperate
- Compulsory employers’ liability insurance
- How liability disputes resolve
- Common mistakes to avoid
- A worked example
- How Hayhills can help
- FAQs
What liability insurance is
Liability insurance is third-party cover. Unlike property insurance, which pays your own loss, liability cover responds when you are legally liable to someone else — for injury, illness, death, property damage or financial loss you caused. It pays the damages or settlement plus the legal costs of defending the claim, up to the limit of indemnity. Four kinds matter most in the UK.
Fast facts: UK liability cover at a glance
- Compulsory cover
- Employers’ liability insurance — required by the Employers’ Liability (Compulsory Insurance) Act 1969.
- Minimum EL limit
- £5 million per claim arising from any one occurrence (most insurers offer £10 million as standard).
- Daily fine for being uninsured
- Up to £2,500 for each day an employer is without valid EL cover.
- Penalty for not displaying the certificate
- Up to £1,000.
- Regulator of claims handling
- The Financial Conduct Authority (FCA), under its ICOBS rules.
- Direct route against an insolvent insured’s insurer
- Third Parties (Rights against Insurers) Act 2010, in force since 1 August 2016.
Public liability (PL)
Responds when a member of the public — a customer, visitor, passer-by or neighbouring owner — suffers injury or property damage connected with your business. A slip in a shop, a falling sign, flooding caused by your works: these are classic PL claims. PL is not compulsory by statute, though many contracts and licences require it.
Employers’ liability (EL)
Responds when an employee is injured or made ill by their work and the employer is at fault. It is compulsory for most employers under the 1969 Act (see below). EL claims often surface years after exposure — the asbestos and industrial-disease “long tail” — making the policy-trigger question especially sharp.
Product liability
Responds when a product you supplied causes injury or damage because it was defective. Liability can be strict under the Consumer Protection Act 1987, so a producer can be liable even without negligence — which is why these coverage questions matter to manufacturers, importers and own-branders.
Professional indemnity (PI)
Responds when a professional — an architect, accountant, surveyor, consultant or adviser — causes a client financial loss through negligent advice, design or service. PI is almost always written on a claims-made basis, which is the single most important thing to understand about it.
The two layers of a dispute
The defining feature of a liability dispute is that there are two arguments happening at once, and they are easy to confuse.
Layer one: the underlying liability claim
This is the dispute between the injured party (the claimant) and the insured (the defendant) about whether the insured is legally responsible at all, and if so for how much. It turns on negligence, breach of duty, causation and the measure of damages — ordinary civil-liability law. The insurer is usually not a party, but it has a deep interest because, if the insured loses, the insurer may have to pay.
Layer two: the coverage dispute
This is the separate dispute between the insured and its own insurer about whether the policy responds to that liability. It turns on the contract: the insuring clause, the conditions, the exclusions, the limit and the excess. An insured can win layer two and still lose layer one, or be found liable yet uninsured for it. The layers can move at different speeds, and a coverage decision can completely change the insured’s position in the underlying claim.
Keeping the layers distinct is essential. A reservation of rights, a declinature, or a coverage review all belong to layer two. The strategy for defending the underlying claim — and who controls it — sits at the join between the two, which is where many disputes ignite.
Occurrence vs claims-made and notification
The first question in almost every coverage dispute is: which policy responds? The answer depends on the policy’s trigger.
| Feature | Occurrence basis | Claims-made basis |
|---|---|---|
| What triggers cover | The injury or damage occurring during the policy period — regardless of when the claim is made | The claim being made against the insured (and notified) during the policy period — regardless of when the act occurred |
| Typical use | Public and employers’ liability | Professional indemnity, directors’ & officers’, some product |
| The “long tail” problem | An old policy can be triggered decades later (e.g. industrial disease) | Cover must be live and renewed continuously, or gaps appear |
| Key risk on cancellation | Past years still respond | No claim can be made once cover lapses unless run-off cover is bought |
| Notification of circumstances | Less central | Critical — reporting a circumstance “deems” any later claim to the current year |
Why the trigger causes disputes
On an occurrence policy, the fight is often when the injury or damage occurred — the date can decide which of several insurers (or which policy year) must pay, and for diseases with long latency that date may be genuinely uncertain. On a claims-made policy, the fight is usually about notification: whether a claim or a “circumstance that may give rise to a claim” was reported to the right insurer in time.
Notification of circumstances
Claims-made policies almost always let (and require) the insured to notify circumstances — facts that might later produce a claim — as well as actual claims. A valid circumstance notification “deems” any claim later arising from those facts to the policy year of the notification, even if the claim lands years later. Get it right and you have continuity of cover; get it wrong — too vague, too late, or to the wrong year — and the claim can fall into a gap between insurers. Disputes over whether a notification was valid are among the most technical in this field and depend heavily on the wording, which is why a precise policy interpretation is so often decisive.
Key coverage concepts
Beyond the trigger, a handful of recurring concepts drive liability coverage disputes.
Aggregation clauses
An aggregation clause decides whether several related claims count as one claim or many. This matters in two directions: for the excess (one excess or several) and for the limit of indemnity (one limit shared, or a fresh limit each time). Wordings vary — claims “arising from one event”, “one originating cause”, “one source”, or “a series of related acts” — and small differences change the answer dramatically. Where many people are affected by a single failing, aggregation can be worth millions.
Reservation of rights
When an insurer is not yet sure a claim is covered, it often acts under a reservation of rights: dealing with the claim for now without admitting the policy responds, while expressly keeping its right to decline later. This lets it investigate without being treated as having accepted cover by its conduct (waiver). A reservation is not a refusal — but it is a warning that a coverage dispute may follow, and the insured should take it seriously.
Declinature
A declinature is the insurer’s decision that the policy does not respond — because an exclusion applies, a condition was breached, the claim falls outside the cover, or there was a qualifying breach of the duty of fair presentation under the Insurance Act 2015. It should set out the grounds clearly. If the insured disagrees, the declinature is the starting gun for the coverage dispute: review, complaint, the Ombudsman where eligible, or proceedings.
Excess, limit and costs
The excess (or deductible) is the first slice the insured bears; the limit of indemnity is the most the insurer will pay. Watch whether defence costs sit inside the limit (eroding it) or are paid in addition — on large PI claims, costs-inclusive limits can leave little for the damages themselves.
The insurer’s right to run the defence
Liability policies almost always give the insurer the right to take over and conduct the defence of the underlying claim in the insured’s name, and to settle it. This makes commercial sense — the insurer is usually paying — but it creates obvious tension when the insurer’s interests and the insured’s diverge.
The conflict point
Conflicts arise where, for example, the claim may exceed the limit (exposing the insured beyond the cover), where part of the claim is uninsured, where a settlement would damage the insured’s reputation, or where the insurer is defending under a reservation of rights. In those situations the insurer must exercise its rights with proper regard to the insured’s interests, not just its own.
QC (now KC) clauses
Many PI and liability policies contain a “QC clause” (today a King’s Counsel clause). It provides that the insurer will not require the insured to contest a claim — and the insured need not consent to a settlement — unless a King’s Counsel advises the claim can be contested with reasonable prospects of success. It is a circuit-breaker for the classic deadlock where the insured wants to fight on principle and the insurer wants to settle: an independent senior barrister’s opinion governs whether the matter is run or resolved.
Third-party rights against insurers
What happens when the liable party goes bust before the claimant is paid? Ordinarily a claimant has no contract with the defendant’s insurer and cannot sue it. The Third Parties (Rights against Insurers) Act 2010 fixes that.
The Act — fully in force since 1 August 2016 — transfers the insolvent (or dissolved) insured’s rights under its liability policy to the third party to whom the liability is owed. In effect, the injured party steps into the insured’s shoes and enforces the policy directly against the insurer. Crucially, it also lets the claimant establish the insured’s liability and the insurer’s obligation in a single set of proceedings, and obtain information about the policy before suing — a major improvement on the old 1930 Act, which forced claimants to restore a dissolved company first. You can read the Act on legislation.gov.uk.
Why it matters in practice: when a builder, manufacturer or professional firm becomes insolvent, the 2010 Act is often the only realistic route to compensation — the policy, not the empty company, is where the money is. The insurer can still raise the same coverage defences it could have raised against the insured, so the coverage dispute does not disappear; it simply moves to a contest between the claimant and the insurer.
Contribution, subrogation and allocation
Liability disputes are not only between insured and insurer. They are frequently between insurers, especially where more than one policy or year is in play.
Contribution between insurers
Where two or more policies cover the same insured for the same loss (double insurance), the doctrine of contribution stops one insurer carrying the whole burden: it can recover a fair share from the others. Disputes turn on whether the policies really cover the same risk and how the share is calculated (often rateably by limit).
Subrogation
Once an insurer has paid, subrogation lets it stand in the insured’s place and pursue whoever actually caused the loss, in the insured’s name, to recover what it paid out. A common scenario: an employer’s insurer pays an injured employee, then subrogates against a negligent third party (a contractor or manufacturer) whose fault contributed to the accident.
Allocation across multiple policies and years
Long-tail claims — disease, gradual property damage, repeated exposure — may span many years and several insurers. Allocation is how the loss is spread across those years and policies. Approaches differ (spread by time on risk, or pinned to the year of injury), and the answer can shift millions between insurers. These are among the hardest disputes in the market and almost always involve detailed expert and legal analysis.
The duty to cooperate
Liability policies impose duties on the insured that, if breached, can themselves become the coverage dispute.
- Notification: tell the insurer of claims and circumstances within the time and manner the policy requires.
- Cooperation: give the insurer information and assistance, attend hearings, provide documents and help with the defence.
- No admissions: do not admit liability, settle, or incur defence costs without the insurer’s consent (often called the “QC/consent” condition).
- Claims mitigation: take reasonable steps to limit the loss.
Since the Insurance Act 2015, an insurer cannot simply walk away for a minor breach of a term unrelated to the actual loss; for terms that reduce a particular type, location or time of risk, its remedy is limited if the breach could not have increased the risk of the loss that happened. But a serious failure — not notifying at all, prejudicing the defence, admitting liability against the policy — can still cost cover. Good co-operation is also central to fair claims handling on both sides.
Compulsory employers’ liability insurance
Employers’ liability is the one piece of liability cover that is compulsory by statute. The Employers’ Liability (Compulsory Insurance) Act 1969 requires most employers carrying on business in Great Britain to insure against liability for injury or disease to their employees arising out of and in the course of employment.
The core requirements
- Minimum cover of £5 million in respect of claims arising from any one occurrence (in practice most insurers provide £10 million as standard).
- Cover must be with an authorised insurer regulated by the FCA.
- The employer must display the certificate (or make it accessible electronically) so employees can see it.
- The Health and Safety Executive (HSE) enforces the duty.
The penalties
Being without valid EL cover can attract a fine of up to £2,500 for every day the employer is uninsured. Failing to display the certificate or to produce it to an HSE inspector can attract a fine of up to £1,000. The duty applies regardless of whether any accident has happened. The statute and HSE guidance are the authoritative sources: see the Act on legislation.gov.uk and the HSE’s guide on the law on employers’ liability insurance.
EL disputes frequently combine the long-tail trigger problem (which historic insurer is on risk for a disease that developed over decades?) with the compulsory-insurance framework. Where the historic insurer cannot be traced, the Employers’ Liability Tracing Office (ELTO) and the industry’s tracing and mesothelioma schemes come into play.
How liability disputes resolve
Coverage disputes do not have to end in court. There is a clear ladder, and most claims are resolved well before the top of it.
| Stage | What happens | Best for |
|---|---|---|
| 1. Coverage review | A close read of the policy against the facts — insuring clause, conditions, exclusions, trigger, notification — to test whether the declinature or reservation is right | Every dispute — the essential first step before anything escalates |
| 2. Negotiation | Structured correspondence and discussion with the insurer or its loss adjuster to resolve or narrow the disagreement | Disputes where the facts or wording leave room for a commercial settlement |
| 3. Complaint & FOS | A formal complaint to the insurer, then referral to the Financial Ombudsman Service if eligible and unresolved after 8 weeks | Consumers and smaller businesses within the FOS eligibility limits |
| 4. Mediation | A neutral mediator helps the parties reach a confidential settlement without a binding ruling | Disputes the parties want resolved quickly, privately and with a preserved relationship |
| 5. Declaratory proceedings | Court proceedings — often a claim for a declaration that the policy does (or does not) respond | Genuine, high-value points of principle that only a binding judgment can settle |
Coverage review (start here)
Almost every coverage dispute is won or lost on the wording. A disciplined review checks the insuring clause first (does the claim fall within the cover at all?), then the trigger and notification, then each condition and exclusion the insurer relies on, against the actual facts. Often a declinature is overstated or based on a misreading, and a well-evidenced response resolves matters without escalation.
Complaint and the Financial Ombudsman Service
FCA-regulated insurers must handle claims fairly, promptly and not reject them unreasonably. If you are unhappy, complain to the insurer first; it has up to eight weeks to respond. If still unresolved and you are eligible, you can take the complaint to the free Financial Ombudsman Service. Eligible complainants broadly include consumers, micro-enterprises (turnover or balance sheet up to €2 million and fewer than 10 staff) and small businesses with turnover under £6.5 million, fewer than 50 employees and a balance sheet under £5 million. Larger businesses fall outside the FOS and must use negotiation, mediation or the courts. The rules are on the Financial Ombudsman Service website.
Mediation
Mediation is well suited to coverage disputes: it is private, fast, and lets the parties craft commercial outcomes a court could not order — an agreed split, a contribution to costs, or a way forward on the underlying claim. It is a non-reserved process and does not require court proceedings.
Declaratory and declinatory-relief proceedings (reserved)
Where a genuine point of principle cannot be resolved any other way, either side can ask the court for a declaration about whether the policy responds — declaratory proceedings (an insurer seeking a declaration of non-liability is sometimes called declinatory relief). This is litigation: a reserved legal activity. At this point Hayhills advises you and introduces a suitable regulated solicitor to conduct the proceedings, while we continue to support the strategy and commercial dimension.
Common mistakes to avoid
- Late or vague notification. On claims-made policies especially, failing to notify a claim or a circumstance in time — or describing it too loosely — is the most common way to lose otherwise valid cover.
- Confusing the two layers. Treating the coverage dispute and the underlying claim as one problem leads to poor decisions; they need separate strategies.
- Admitting liability or settling without consent. Most policies make this a breach of condition and can jeopardise cover.
- Ignoring a reservation of rights. A reservation is a signal that cover is in doubt; carry on as if nothing happened and you may be caught out at the worst moment.
- Letting cover lapse on a claims-made policy. Cancel or retire without buying run-off cover and future claims about past work have no policy to land on.
- Assuming “I have insurance” means “I will be paid”. Exclusions, conditions, excess and the limit all stand between the claim and the cheque.
- Missing the FOS window or eligibility. Eligible complainants who do not complain promptly, or assume they are too big or too small, can lose a free, effective route.
A worked example
The facts. Meridian Surveys Ltd, a firm of building surveyors, is sued by a developer client who says a negligent 2022 survey under-reported structural defects, causing a £480,000 loss. Meridian holds professional indemnity cover on a claims-made basis: a £1 million limit, a £25,000 excess, and defence costs payable in addition to the limit.
Trigger and notification. The claim is first made in 2026. Because the policy is claims-made, the current (2026) PI policy responds — not the 2022 policy in force when the survey was done — provided cover was maintained continuously and the claim is notified to the 2026 insurer in time. Meridian notifies within days; good continuity of cover saves the claim.
The coverage question. The insurer reviews under a reservation of rights, querying an exclusion for work outside Meridian’s stated discipline. A coverage review shows the survey was squarely within the insured activities; the reservation is withdrawn and cover confirmed.
The numbers. The claim settles at mediation for £300,000. Meridian pays its £25,000 excess; the insurer pays the remaining £275,000, well within the £1 million limit. Defence costs of £40,000 are met on top of the limit, because the policy is costs-in-addition. Meridian’s total out-of-pocket cost is the £25,000 excess — instead of a £480,000 catastrophe.
The lesson. Three things turned a near-disaster into a managed cost: the policy was live and renewed, the circumstance was notified promptly to the right year, and a coverage review defeated an over-broad reservation. Had Meridian let the PI cover lapse after 2022, no policy would have responded to a 2026 claim at all.
How Hayhills can help
Make the policy respond — and resolve the dispute
Hayhills Legal Advisory helps policyholders, businesses and professionals navigate liability and coverage disputes. We carry out coverage reviews of public liability, employers’ liability, product and professional indemnity policies; test reservations of rights and declinatures; advise on notification, aggregation and allocation; and negotiate and mediate with insurers and loss adjusters to get fair outcomes. These are non-reserved services and we deliver them directly.
Where a dispute can only be resolved by court action — declaratory or declinatory-relief proceedings, or litigation of the underlying claim — that is a reserved activity, so we advise you and introduce a suitable regulated solicitor to conduct it, staying alongside you on strategy. Come to us when a claim is brewing, when a reservation or declinature lands, or before you renew.
Speak to our team or call 0203 581 5789.
Frequently asked questions
What is a liability insurance dispute?
It is a disagreement that arises when someone is blamed for loss or injury. It has two layers: the underlying claim about who is at fault between the claimant and the insured, and a separate coverage dispute between the insured and its insurer about whether the policy will actually pay.
What is the difference between occurrence and claims-made cover?
Occurrence cover responds to injury or damage that happens during the policy period, whenever the claim is later made. Claims-made cover responds to claims first made (and notified) during the policy period, whenever the underlying act occurred. Public and employers’ liability are usually occurrence; professional indemnity is usually claims-made.
Why does notifying a circumstance matter so much?
On a claims-made policy, notifying a circumstance that may give rise to a claim “deems” any later claim to the year you notified, even if the claim lands years afterwards. Notify late, vaguely or to the wrong year and the claim can fall into a gap between insurers with no cover.
What does a reservation of rights mean?
It means the insurer is dealing with your claim for now without admitting the policy responds, expressly keeping its right to decline later while it investigates. It is not a refusal, but it is a warning that a coverage dispute may follow, so you should take advice and not assume you are covered.
Can I sue an insurer directly if the company that harmed me went bust?
Often yes. The Third Parties (Rights against Insurers) Act 2010 transfers the insolvent insured’s policy rights to you, so you can enforce the liability policy directly against its insurer and establish both liability and cover in one set of proceedings. The insurer can still raise the policy defences it had against the insured.
Is employers’ liability insurance compulsory?
Yes. Under the Employers’ Liability (Compulsory Insurance) Act 1969 most employers must hold at least £5 million of cover with an authorised insurer and display the certificate. Being uninsured can attract a fine of up to £2,500 per day, and failing to display the certificate up to £1,000.
What is the QC (or KC) clause in a liability policy?
It is a clause providing that you will not be required to contest a claim, and need not agree a settlement, unless a King’s Counsel advises the claim can be contested with reasonable prospects of success. It breaks the deadlock when the insured wants to fight and the insurer wants to settle.
Can I take a coverage dispute to the Financial Ombudsman?
If you are eligible, yes. Consumers, micro-enterprises and small businesses (broadly turnover under £6.5 million, under 50 staff, balance sheet under £5 million) can refer an unresolved complaint to the free Financial Ombudsman Service after complaining to the insurer first. Larger businesses must use negotiation, mediation or the courts.
What are contribution and subrogation between insurers?
Contribution applies where two policies cover the same loss, letting one insurer recover a fair share from the other. Subrogation lets an insurer that has paid stand in the insured’s shoes to pursue whoever actually caused the loss. Both spread liability fairly rather than leaving one party to carry it all.
Do I need a solicitor to resolve a liability dispute?
Not always. Coverage review, negotiation and mediation are non-reserved and can be handled by an adviser like Hayhills directly. Only court proceedings — such as declaratory or declinatory-relief claims — are reserved, where we advise you and introduce a regulated solicitor to conduct the litigation.
This article is for general information only and does not constitute legal or accountancy advice. Hayhills Limited, trading as Hayhills Legal Advisory, provides non-reserved legal advisory services. Always check current requirements at GOV.UK.