B2B demand generation ad rules explained for briefing teams

What to take away

Most teams brief the creative before they check whether the claims can be substantiated. The Advertising Standards Authority can require evidence for every objective claim, and the burden sits with the advertiser, not the agency.
B2B email under PECR still counts as electronic mail. The soft opt-in only covers existing customers, so a purchased list of business addresses is not a lawful basis.
The CAP Code applies to business-to-business advertising in England. It is not limited to consumer campaigns.
Keep a dated evidence file for each claim, each consent source and each suppression request. If a complaint arrives, the file is the defence.

Claim substantiation before the campaign goes live

Check every objective claim against a document you hold

The relevant code is the CAP Code, formally the UK Code of Non-broadcast Advertising and Direct & Promotional Marketing. It applies UK-wide, including to B2B ads. Rule 3.1 prohibits misleading advertising, and rule 3.7 requires documentary evidence for objective claims before publication. Rules 3.33–3.35 cover comparisons with identifiable competitors, while rule 3.45 requires testimonials to be genuine and supported by evidence. The ASA's AdviceOnline library explains how these requirements apply in practice. Before sign-off, list each claim, the document behind it and the date. If no document exists, cut the claim or soften it to an opinion.

Claim substantiation sign-off

List each objective claim
Attach the document behind it
Date the evidence
Cut or soften unsupported claims
Check comparative claims like-for-like
Name the price-check date

Comparative claims carry a higher bar. If you say your service costs less than a named rival, the comparison must be like-for-like and based on a price a buyer would actually pay. Name the date the price was checked.

Testimonials and case studies need permission and accuracy

A named client quote needs written approval from someone able to give it. An unnamed quote needs to be genuine and not selectively edited. If a result came from one sector or one quarter, say so. Averages presented as typical outcomes mislead by omission.

Keep the approval in writing, with the date and the exact wording signed off. Permission to quote a client in one case study does not automatically cover a paid ad on another platform, so confirm the scope before you reuse it.

Check each paid platform's advertising policies

Before booking paid distribution, check the current policy requirements for the ad, targeting, landing page, content and format. For LinkedIn, review LinkedIn Advertising Policies; for Google, Google Ads policies; and for Meta, Meta Advertising Standards. These platform policies sit alongside legal requirements: satisfying a platform policy does not establish compliance with the law.

For the wider picture of agency contracts and data handling, the B2B demand-generation UK rules and compliance guide covers obligations beyond the advertising sign-off checks in this section.

Email, data and consent under PECR

Work out which lawful basis you are relying on

PECR is the Privacy and Electronic Communications Regulations 2003. Regulation 22 restricts unsolicited marketing by electronic mail to individual subscribers unless they have given prior consent or the soft opt-in applies. The soft opt-in is limited to contact details collected during a sale or negotiations for a sale, marketing the sender's own similar products or services, and giving a clear way to refuse at collection and in every message. The ICO's Direct marketing guidance, in its electronic mail marketing section, explains these requirements. Where contact details are personal data, also identify and document a lawful basis under the UK GDPR and comply with the Data Protection Act 2018.

Subscriber types under PECR

Individual subscriber

Who: Sole traders, partnerships
Email rules: Apply
Consent: Specific and recorded
Mixed lists: One rule rarely fits

Corporate subscriber

Who: Limited companies, LLPs
Email rules: Do not apply
Consent: Not required
Mixed lists: One rule rarely fits

PECR distinguishes subscriber types. Sole traders and ordinary partnerships are individual subscribers, so regulation 22's consent rule applies to their marketing emails. Limited companies and LLPs are corporate subscribers, and regulation 22 does not require prior consent to email them; regulation 23 still requires the sender's identity and a valid address for opting out. Most B2B lists mix subscriber types, and UK GDPR and the Data Protection Act 2018 may also apply where the records contain personal data.

Record the source of every contact

A spreadsheet column called "source" is not enough. Record the date, the collection method, the exact wording shown at collection and the opt-in box state. If a prospect asks where their data came from, you should be able to answer within a day.

Scoring your campaign before launch

Use a rubric, not a gut feeling

Score each line before the first ad goes live. Anything scoring 0 or 1 goes back to the team that owns it.

Pre-launch campaign scoring rubric

Claim evidencedated document held
Email consentnamed source and date
Testimonial permissionwritten approval
Opt-out handlingworks in all templates
Comparative claimslike-for-like basis stated
Sector-specific ruleschecked

Run the rubric again whenever a claim, an offer or a data source changes. Date each version and keep the signed copy with the campaign file.

Check	Score 2	Score 1	Score 0
Claim evidence	Dated document held	Document requested	No source
Email consent	Named source and date	Partial record	Purchased list
Testimonial permission	Written approval	Verbal approval	None
Opt-out handling	Works in all templates	Manual process	No process
Comparative claims	Like-for-like basis stated	Basis unclear	No basis
Sector-specific rules	Checked	Assumed	Ignored

Escalate anything that scores below two

A single zero on consent or claim evidence should stop the campaign. For PECR and data-protection issues, start with the ICO; for CAP Code advertising complaints, the ASA is the relevant body. The CMA is relevant where wider competition or consumer-protection issues arise. The UK regulations overview gives additional context on how these bodies' roles differ.

Marketing automation and drafting tools can speed campaign work, but they do not transfer the legal duty away from the advertiser. Check generated claims, audience choices and final ad copy against the evidence and rules before sign-off.

Common questions

Does the CAP Code apply to B2B advertising in England?

Yes. The CAP Code covers business-to-business marketing communications as well as consumer ones throughout the UK, not just in England. The ASA can investigate a complaint about a B2B campaign and publish an upheld ruling.

Can I email business addresses without consent?

For individual subscribers, you generally need prior consent unless the soft opt-in applies: the address was collected during a sale or negotiations for a sale, the marketing is for your own similar products or services, and an opt-out was offered at collection and in each message. A purchased list alone does not establish valid consent. For corporate subscribers, regulation 22 does not require prior consent, but regulation 23's sender-identification and opt-out requirements still apply; UK GDPR may also apply to personal data.

Who is liable if an agency writes a misleading claim?

The advertiser is responsible for the claim in the ad. Agencies can also be named in a ruling. Contractual indemnities help between the parties but do not change the regulator's view.

Do I need a qualified adviser for a specific campaign?

This article is general guidance only. Individual cases, particularly around consent records or comparative claims, need a qualified adviser.