SAAMCo and scope of duty: what a professional is actually liable for
Category: Professional indemnity · Reviewed by the Apex broking team · Last reviewed 2026-08-22 · ~7 min read
The idea in one line
Liability is limited to the consequences of the thing the professional was actually engaged to get right. The classic illustration — from the House of Lords in SAAMCo itself — is the mountaineer who is negligently told his knee is fit, climbs, and is injured in an avalanche. The doctor was wrong, and but for the advice the injury would not have happened. The doctor is still not liable, because an avalanche is not the risk the knee examination was directed at.
Applied to commerce: a valuer who over-values a property is responsible for the lender’s loss attributable to the property being worth less than stated, not for the additional loss the lender suffers because the market collapsed after the loan was made.
The three decisions that built it
South Australia Asset Management Corp v York Montague Ltd established the principle and drew the distinction between a professional who provides information for the purpose of a decision the client makes, and one who advises on the decision itself. On the information side, liability is limited to the consequences of the information being wrong; on the advice side, it can extend to the consequences of the transaction as a whole.
BPE Solicitors v Hughes-Holland is the case that stopped the distinction being used as a general-purpose limiting device. The Supreme Court made clear that the “advice” category is narrow — it covers the professional who is responsible for guiding the whole decision, which is rare — and that in the far more common information case the burden is on the claimant to prove what loss was actually attributable to the error.
Manchester Building Society v Grant Thornton UK LLP [2021] UKSC 20, decided alongside Khan v Meadows [2021] UKSC 21, reframed the whole analysis around the purpose of the duty rather than the label attached to the engagement.
The six questions from Manchester Building Society
The Supreme Court set out a sequence for analysing a professional negligence claim. It is worth working through in order, because most disputes are really about question two or question five.
- Actionability. Is the harm the claimant complains of actionable in negligence at all?
- Scope of duty. What are the risks of harm that the law imposed a duty on the defendant to guard against? This is where the purpose of the engagement is identified.
- Breach. Did the defendant breach that duty?
- Factual causation. Does the loss flow from the defendant’s act or omission?
- Duty nexus. Is there a sufficient connection between the harm suffered and the subject matter of the duty?
- Legal responsibility. Is the harm too remote, or caused by an intervening act, or reduced by a failure to mitigate?
Information and advice: no longer a strait-jacket
The court in Manchester Building Society deliberately downgraded the information/advice dichotomy. It is a useful description of two ends of a spectrum, not a rigid classification that decides the case. The primary question is the purpose for which the professional was engaged, identified objectively from the circumstances of the retainer — what the professional was being asked to protect the client against.
In practice this shifts attention from clever categorisation towards the documents: the engagement letter, the scope of works, the caveats and assumptions, the reliance language. Those are where the purpose of the duty is evidenced.
The counterfactual as a cross-check
The traditional SAAMCo counterfactual — would the claimant have suffered the same loss if the information given had been correct? — survives, but with reduced status. The Supreme Court warned against elaborate hypothetical exercises drifting away from reality, and treated the counterfactual as a cross-check on a conclusion reached by analysing the purpose of the duty, rather than as the primary test.
What it means for professional indemnity
Scope of duty is a quantum argument, and it is often the most valuable one available to a defendant professional. A claim pleaded at the full value of a failed transaction can be worth a fraction of that once the loss attributable to the specific error is separated out. That has three practical consequences.
First, it makes the engagement letter an insurance document as well as a commercial one. Clear scope, stated assumptions, express caveats and defined reliance are what a scope of duty defence is built from. Firms that issue engagement terms as an afterthought are giving away their best defence.
Second, it complicates limit-setting. A scope of duty argument may cut a claim down substantially — but it is argued at trial, and defence costs are incurred long before then. Where defence costs erode the limit, the limit needs to be sized for the fight as well as for the exposure. We work through that in our guide to sizing a PI limit.
Third, it makes early notification more valuable, not less. Insurers can only fund and shape a scope of duty defence if they are told early enough to influence how the case is run.
Practical points
Write the purpose of the engagement into the engagement letter, in terms a court could read back. “We are providing a valuation for the purpose of X and no other purpose” is worth more than a page of exclusions.
Record the assumptions you were told to make and who told you to make them. Scope of duty disputes turn on what the professional was asked to protect the client against, and assumptions define that boundary.
When a claim arrives, resist arguing it is worth nothing. Argue what part of the loss the retainer was directed at. That is the argument the courts are now asking for.
Frequently asked questions
What is the SAAMCo principle in plain terms?
A negligent professional is liable only for the loss that falls within the scope of the duty they undertook — the consequences of the thing they were engaged to get right — not for every loss that would have been avoided if they had not been negligent.
Is the information versus advice distinction still good law?
It is still used, but it is no longer decisive. In Manchester Building Society v Grant Thornton the Supreme Court held that the focus should be on the purpose of the duty, objectively assessed from the engagement, and warned against treating the information/advice labels as a strait-jacket.
Does scope of duty reduce what my insurer has to pay?
It may reduce what you are held liable to pay, which in turn reduces the indemnity. It does not reduce defence costs, which are often incurred in full to establish the argument. Whether those costs sit inside or outside the limit is a wording question worth checking.
How do I improve my scope of duty position before a claim?
Through documentation, not insurance. Clear engagement terms stating the purpose of the work, the assumptions made, the limits of the exercise and who may rely on it are what the argument is built from at trial.
Sources
This page is general insurance information, not legal advice, and describes the position as at August 2026. Cover depends on the wording of the policy actually in force. Apex Insurance Brokers Limited is authorised and regulated by the Financial Conduct Authority.
Apex Insurance Brokers Limited is authorised and regulated by the Financial Conduct Authority (FRN 724952). This page is general information, not advice on a specific policy.