What professional negligence actually means

Not every disappointing outcome is negligence. A solicitor who advises you to settle, and you later wish you had gone to proof, has not been negligent because the advice turned out badly. The question a Scottish court asks is narrower and harder than most people expect.

The Scottish test comes from Hunter v Hanley 1955 SC 200, decided in the Inner House of the Court of Session. Although it is best known as the medical negligence case, Scottish courts apply it across the professions, and it was applied to a firm of solicitors as recently as March 2026 in Lamb v Bennett [2026] CSOH 16. Three things must be established. That there is a usual and normal practice. That the professional did not follow it. And, critically, that no professional of ordinary skill acting with ordinary care would have taken the course this one took.

That third limb is what defeats most claims. It is not enough that another solicitor would have done it differently, or even that most would. The course taken has to be one that no reasonably competent practitioner would have taken. Where two respectable bodies of professional opinion exist, following either of them is not negligence.

You will normally need evidence from another practitioner in the same field to establish the usual and normal practice and the departure from it. In Cockburn v Hope [2024] CSOH 69 Lord Sandison declined to treat that as an invariable rule, holding that whether expert evidence is required depends on whether the decision criticised differs from routine decision making. But in practice, a professional negligence action raised without a supportive report from an appropriate practitioner is an action in difficulty from the outset.

Proving the loss is usually harder than proving the negligence

The second half of the case is causation, and it is where a great many otherwise sound claims fail. It is not enough to show that your solicitor was negligent. You have to show that the negligence caused you a loss, and you have to show the size of that loss.

If a solicitor allowed your claim to prescribe, the measure of your loss is not the amount you were hoping for. It is the value of the claim you lost, discounted for the risk that you would not have won it, and discounted again for the risk that the defender could not have paid. Courts refer to this as a claim for the loss of a chance, and it means running the original case, in outline, inside the negligence case. Two cases for the price of one, and you carry the burden in both.

The five year clock, and when it starts

This is the single most important thing on this page, and the point on which English guidance will mislead you.

Section 6 of the Prescription and Limitation (Scotland) Act 1973, read with paragraph 1(d) of Schedule 1, applies the five year short negative prescription to any obligation to pay damages, whatever the source of the obligation. If five years pass without a relevant claim being made and without the obligation being acknowledged, the obligation is extinguished.

The word matters. An English limitation period bars the remedy but leaves the right in existence, which is why an English court has a discretion to let some claims through late. Scottish prescription destroys the obligation itself. Once it has gone, there is nothing left for a court to revive.

When does the clock start? Section 11(1) says the obligation becomes enforceable on the date the loss occurred. Section 11(3) postpones that where you were not aware, and could not with reasonable diligence have been aware, of three things: that loss had occurred, that it was caused by a person’s act or omission, and the identity of that person.

Two warnings follow from that, and they pull in opposite directions.

The first is that most of the reported Scottish authority on when the clock starts was decided under the old test and should be read with care. Morrison, Gordon’s Trustees v Campbell Riddell Breeze Paterson LLP [2017] UKSC 75, WPH Developments Ltd v Young & Gault LLP [2021] CSIH 39 and Tilbury Douglas Construction Ltd v Ove Arup & Partners Scotland Ltd [2024] CSIH 15 all construe wording that has since been replaced. There is, as at August 2026, no appellate decision on the new test.

The second is that the new test is narrower than people hope. Section 11(3B) says expressly that it does not matter whether you knew the act or omission was actionable in law. You do not have to know you have a claim for the clock to run. And Gordon’s Trustees, which was itself a solicitors’ negligence case about badly drafted notices to quit, held that it is enough to be aware that you have incurred expenditure or have not obtained something you sought. You do not need to know that anything has gone wrong.

Behind all of it sits section 7. Twenty years after the act or omission, the obligation is extinguished regardless of what anyone knew or could have discovered. Section 11(4), in force since 28th February 2025, confirms that the twenty year period runs from the act or omission rather than from the date the loss appeared. For latent defects in buildings, that is often the provision that decides the case.

One modest safety valve exists. Section 13 of the 1973 Act, in force since 1st June 2022, allows the parties to agree to extend a five year prescriptive period by up to one year. It can be done once, and only after the period has started and before it would otherwise expire. Solicitors call these standstill agreements. They are useful where an investigation is genuinely close to completion, and no use at all if you leave matters until the last fortnight.

Where personal injury sits, and why it is different

Claims for reparation for personal injuries are carved out of both the five year and the twenty year prescriptions, by paragraph 2(g) of Schedule 1 and by section 7(2). They run instead on the three year limitation period in section 17, with the section 19A discretion to allow a late action. That discretion exists nowhere else in this area.

Complaint or claim: they are not the same thing

People often assume that complaining to the Scottish Legal Complaints Commission and suing a solicitor are two ways of doing the same thing. They are not, and choosing the wrong one wastes time you may not have.

The Commission is the single gateway for complaints about legal practitioners in Scotland. It deals with two things: inadequate professional service, and conduct. It is free, it does not require you to instruct anyone, and the time limit is three years from when the service ended or the conduct occurred, with a limited discretion to accept a late complaint in exceptional circumstances.

What it can do is apologise on the practitioner’s behalf, order fees to be refunded or reduced, order the work to be put right, and award compensation. The total compensation limit is £20,000, within which no more than £5,000 may be awarded for inconvenience and distress. The Commission’s own published figures show that awards for inconvenience and distress most commonly fall between £150 and £750, and average around £900.

A court action is the other route. There is no ceiling on it, and it can compensate financial loss the Commission cannot reach. But it costs money to run, it requires expert evidence, and it carries the risk of paying the other side’s expenses if it fails. The Commission is required to take into account any damages a court has awarded, so the routes do not stack.

Broadly, a complaint fits poor communication, delay, unexplained fees and shoddy work that has annoyed you rather than impoverished you. A claim fits a quantifiable financial loss, and particularly a substantial one.

Who actually pays

Every Scottish solicitor in private practice is covered by the Master Policy, the compulsory professional indemnity insurance arranged by the Law Society of Scotland. The current limit of indemnity is £2 million for any one claim, with defence costs covered in addition. Claims attributable to the same act, error or omission, or to a series of them arising from the same original cause, are treated as one claim with one limit.

You do not claim on the Master Policy yourself. The claim is intimated to the firm, which notifies its insurers, and the insurers take it from there. In practice this means that a claim against a small firm is answered by an insurer with the resources of a large one.

The Client Protection Fund, formerly the Scottish Solicitors’ Guarantee Fund, is a different thing entirely and is regularly confused with the Master Policy. It exists under section 43 of and Schedule 3 to the Solicitors (Scotland) Act 1980 to compensate clients who have lost money through the dishonesty of a solicitor or their staff. It expressly does not cover losses arising solely from professional negligence, which are directed to the Master Policy instead. The maximum grant is £1.25 million, and applications must be made within one year of the loss coming to your attention. That one year is much shorter than the prescriptive period, and it catches people out.

Which court, and what it costs

Under section 39 of the Courts Reform (Scotland) Act 2014, civil proceedings seeking orders of value totalling £100,000 or less, exclusive of interest and expenses, are within the exclusive competence of the sheriff court and may not be raised anywhere else. Above that figure you may choose the sheriff court or the Court of Session. The provision has been fully in force since 22nd September 2015.

On funding, a success fee agreement is available. Under the Civil Litigation (Expenses and Group Proceedings) (Scotland) Act 2018 and the Success Fee Agreements Regulations 2020, SSI 2020/110, professional negligence falls into the residual category of “any other matter”, where the cap is 50 per cent of the financial benefit obtained, inclusive of VAT. That is a much higher cap than the 20, 10 and 2.5 per cent bands that apply to personal injury work, and it reflects the greater risk these cases carry.

What to do first

Get the file. You are entitled to your own papers, and a professional negligence claim is built out of the correspondence, the attendance notes and the dates. Then work out, honestly, when you first knew that you had incurred a cost or had not got what you were seeking, because that is where a court will start counting.

Then take advice from a solicitor who does this work, and take it early. Five years sounds generous until you discover that the clock has been running for three of them and that a report from an appropriate practitioner takes several months to obtain.

Sources

• Prescription and Limitation (Scotland) Act 1973, section 6 and Schedule 1, legislation.gov.uk
• Prescription and Limitation (Scotland) Act 1973, sections 7, 11 and 13, legislation.gov.uk
• The Prescription (Scotland) Act 2018 (Commencement, Saving and Transitional Provisions) Regulations 2022, SSI 2022/78, legislation.gov.uk
• Courts Reform (Scotland) Act 2014, section 39, legislation.gov.uk
• The Civil Litigation (Expenses and Group Proceedings) (Scotland) Act 2018 (Success Fee Agreements) Regulations 2020, SSI 2020/110, legislation.gov.uk
• How solicitors are insured and the Client Protection Fund, Law Society of Scotland
• Action we might take, Scottish Legal Complaints Commission
• Lamb v Bennett [2026] CSOH 16, Scottish Courts and Tribunals Service
• Gordon’s Trustees v Campbell Riddell Breeze Paterson LLP [2017] UKSC 75, The National Archives

This page explains the law in general terms and is not advice on your own situation. It states the position as at 14th August 2026. Prescriptive periods are unforgiving and the facts of your case will determine when yours started. Take advice from a solicitor before relying on anything here.