CAP Code checks for law firm advertising

What to take away

How the CAP Code applies to professional-services advertising

The CAP Code is the UK Code of Non-broadcast Advertising and Direct and Promotional Marketing. It is written by the Committee of Advertising Practice and enforced by the Advertising Standards Authority. It applies to ads in paid search, social media, display, print, direct mail and most firm websites where the content counts as a marketing communication.

The ASA's remit covers marketing communications, not the provision of legal services itself. That distinction matters. A solicitor's conduct, fees and client care are matters for the Solicitors Regulation Authority. How the firm describes those things in an ad is a CAP Code matter. The two regimes run in parallel, and a single piece of copy can breach both.

Scotland and Northern Ireland have their own professional bodies and slightly different conduct rules, but the CAP Code applies across the United Kingdom. A firm with offices in Cardiff, Manchester and London is therefore working to one advertising code and several conduct regimes.

The advertising rules that govern a campaign are the CAP Code plus whichever regulator supervises the firm.

The full set of codes is published by the ASA. The Advertising codes - ASA | CAP page is the starting point for any compliance review, because it sets out the rules on misleading advertising, comparisons, testimonials and substantiation that the rest of this guide draws on.

Where the CAP Code stops and the SRA starts

The CAP Code governs the ad. The SRA governs the solicitor. A claim about success rates in a Google ad is an advertising claim. The same figure quoted in a client care letter is a conduct question. Marketing teams should route anything that touches outcomes, fees or regulatory status past both the compliance lead and the firm's COLP.

The Financial Conduct Authority matters where a firm does financial services work, such as some probate, investment or claims-related activity. The Information Commissioner's Office matters for consent and data in email and retargeting. None of these replace the CAP Code; they sit alongside it.

Which channels fall inside the remit

Paid search ads, social posts, display banners, sponsored content, email and direct mail are all in scope. So is much of a firm's own website, because the ASA treats a company's own marketing communications as advertising. Third-party directory profiles that a firm controls or pays for can also be caught.

Editorial coverage a firm does not control is generally outside the remit. That is why a press mention is treated differently from a paid advertorial. The distinction is control, not format.

Misleading claims, comparisons and superlatives in law firm marketing

The core rule is that a marketing communication must not mislead. The ASA assesses this through the likely effect on the average consumer, not through the advertiser's intention. A claim can be literally true and still misleading if it implies something the evidence does not support.

Outcome claims are the most common problem. "We win 95% of tribunal cases" needs a defined population, a defined period, a defined meaning of win, and evidence held on file. Without those, the claim is likely to breach the misleading advertising rules.

The same applies to "no win, no fee" if the conditions are buried, and to "free consultation" if a fee follows.

Superlatives are treated as objective claims. "The leading employment firm in the North West" invites the ASA to ask what measure, over what period, and against which competitors. "Award-winning" is safer if the award is named and recent. "Best" is rarely defensible.

Comparisons must compare like with like

Comparative advertising is allowed and can be effective, but it must be fair. A comparison must compare services that meet the same need, must not discredit a competitor unfairly, and must be capable of substantiation.

A price comparison between a fixed-fee conveyancing quote and an hourly-rate quote may not compare like with like. Explain what each price includes and the circumstances in which it applies, so readers can assess the comparison.

If a firm compares itself with a named competitor, the comparison must be based on verifiable facts, not on a survey the firm designed to produce a favourable result. The Rulings - ASA | CAP archive is the practical precedent bank for this, and it is worth reading before signing off any head-to-head claim.

Substantiation is a before-publication duty

The burden sits with the advertiser. A firm must hold evidence before the ad runs, not assemble it after a complaint. For a typical law firm marketing claim, that means documented case data, dated fee schedules, or a published ranking with clear methodology.

Where evidence is thin, soften the claim to what can be proved. "We have handled more than 200 employment tribunal claims since 2019" is defensible if the file supports it. "We are the top employment firm in England and Wales" is not, unless a recognised ranking says so.

Worked example: rewriting a risky claim

A firm drafts this headline for a paid search ad: "The UK's most successful personal injury firm, with a 98% success rate."

Step 1: identify the claims. There are two: a superlative ("most successful") and a statistic ("98% success rate").

Step 2: test each against evidence. The firm has no national ranking and no audited success-rate data.

Step 3: replace with provable statements. "Personal injury specialists with over 1,500 settled claims since 2018" is supported by the case management system.

Step 4: add the qualifying information where the claim needs context, such as that most claims settle before a hearing.

Step 5: record the evidence and the sign-off in the campaign file, so the position can be defended if a complaint arrives.

Testimonials, endorsements and client consent under the CAP Code

Testimonials are persuasive and heavily used in legal marketing, particularly on practice-area pages. The CAP Code requires that testimonials be genuine, that they relate to the service advertised, and that they are not misleading by omission. A testimonial from a client whose case was atypical, presented as typical, is a problem.

Consent is the practical starting point. A client's review of their matter is personal data and often confidential information. Publishing it without permission can breach the ICO's data protection rules as well as the CAP Code, and it can breach the SRA's confidentiality obligations.

A firm's disclosure policy should set out how consent is captured, recorded and withdrawn.

Endorsements from barristers, experts or other professionals carry extra risk. A barrister's endorsement of a solicitor firm can raise questions about independence and about the regulated status of the endorser. If the endorsement implies a regulatory approval that does not exist, the ad is misleading regardless of the endorser's good faith.

What a compliant testimonial record contains

Review platforms and aggregated ratings

Aggregated star ratings are treated as claims. A firm showing "4.9 out of 5 from 300 reviews" must be able to show where the figure came from and that it is current. Cherry-picking the best platform while ignoring a lower rating elsewhere can mislead if the overall impression is better than the evidence supports.

Incentivised reviews should be disclosed. A discount offered in exchange for a review does not automatically breach the code, but hiding the incentive can. The Claims, endorsements and testimonials - ASA | CAP guidance is the reference point for how the ASA approaches these cases.

Applying the CAP Code to legal-services advertising

For law firms, the practical CAP Code tests include whether claims are supported by evidence, comparisons are fair and testimonials are genuine. These principles give marketing teams a framework for reviewing copy before publication.

Common risk areas include outcome statistics without a clear basis, fee offers whose conditions are hard to see, and comparisons that cannot be verified. The compliance task is to make the evidence and any important qualifications clear in the advertisement itself.

The central question is what impression the whole advertisement gives and whether the available evidence supports it.

Price-led advertisements also need qualifying information close enough to the headline to avoid a misleading impression. If a fee applies only in defined circumstances, explain the conditions prominently rather than relying on a separate terms page.

Using ASA rulings as a practical reference

If you consult an ASA ruling, extract the claim, the evidence the advertiser held, and the ASA's reasoning. Then map those points onto your own live campaigns. A ruling can help a firm assess whether its wording and supporting evidence are likely to withstand scrutiny.

The UK rules and ethics guide covers the wider regulatory context; this guide focuses on applying the CAP Code to advertising copy.

Accountancy firms face the same CAP Code tests as law firms. Both sectors sell expertise, rely on trust signals and may use outcome statistics in their marketing. The same questions help review a claim in either sector: what does the evidence show, and could the wording mislead?

ASA sanctions and referrals

The ASA prefers to resolve cases by securing a change. Most complaints end with the advertiser amending or withdrawing the ad. Where an advertiser refuses, the sanctions escalate. The Sanctions - ASA | CAP page sets out the available measures, which include requiring amendments, withdrawing preferential treatment such as paid search placements, and publishing the case.

The most visible sanction is the non-compliant online advertisers list. The Non-compliant online advertisers - ASA | CAP list names advertisers whose online ads remain in breach, and search platforms use it to remove or restrict those ads. For a law firm, appearing on that list is a reputational problem as much as an advertising one.

Referral is the other route. Serious or repeated breaches can be referred to Trading Standards or, for regulated firms, to the relevant professional body. A referral to the SRA over a misleading claim can trigger a conduct investigation that costs far more than amending the ad would have.

Due diligence on partners and lead generators

Firms increasingly buy leads or co-market with claims companies and comparison sites. If the partner's ad is misleading, the firm's brand can be caught up in the complaint. Check whether a prospective partner appears on the non-compliant list before signing, and check again at renewal.

Use the quality checklist to make partner checks short and repeatable; this is preferable to waiting for a complaint.

Running a CAP Code compliance check before a campaign goes live

A compliance check is a short, documented process, not a legal review. It should take an hour for a standard campaign and produce a record that survives a complaint. Assign one owner, usually the marketing manager, with the COLP or compliance lead as escalation.

The pre-launch checklist

Keeping the check current

Claims age. A "since 2019" figure becomes stale, a ranking lapses, a review platform changes its scoring. Diarise a review for every claim with a date attached, and re-run the check when a campaign is refreshed rather than only when it launches.

Common questions

Does the CAP Code apply to a law firm's website?

Yes, where the content is a marketing communication. Practice-area pages, fee pages and promotional content are in scope. The ASA can act on its own initiative as well as on complaints.

Can a law firm advertise success rates?

It can, if the figure is defined, evidenced and not misleading by omission. The firm must hold the underlying data before publication and be able to explain what counts as a success.

Do we need written consent for every client testimonial?

In practice, yes. Consent should be written, dated and specific to the wording and channel, and the firm needs a way to withdraw the testimonial if the client changes their mind.

What happens if the ASA upholds a complaint?

The usual outcome is a requirement to amend or withdraw the ad, with the case published. Persistent non-compliance can lead to paid search restrictions, naming on the non-compliant online advertisers list, or referral to Trading Standards or a professional body.

Does the SRA care about ASA rulings?

It can. A misleading advertisement may also breach SRA conduct rules on integrity and publicity. A referral from the ASA to the SRA is possible, and the firm's own regulator can act independently.

How often should we re-run the compliance check?

At every new campaign and at every refresh of an existing one. Claims with dates, rankings or ratings attached should be reviewed at least annually.