B2B influencer marketing vendor due diligence explained

What to take away

Vendor due diligence is the evidence a buyer gathers on a supplier before signing: who they are, how they label paid work, how they handle data and what happens if the engagement ends early.

Why does vendor due diligence start with the legal entity?

Begin with the registered company, not the pitch deck. Search the name at Companies House and compare the registration number on the contract with the one on the invoice.

For a limited company, review its Companies House filing history and latest filed accounts for missed filings or signs of financial distress. Consider a separate credit check through Creditsafe or Experian, and record what you find; neither check guarantees that a supplier can deliver.

A trading name can hide a different entity or a dissolved predecessor. If the signatory is not a listed director, ask for written authority before money moves. Check the VAT number too, and ask for a certificate of professional indemnity cover. Neither proves quality, but both are quick to verify and awkward to chase later.

Before appointment, screen the supplier, its directors and, where identifiable, beneficial owners against the UK Sanctions List. Apply proportionate anti-money-laundering (AML) checks on ownership and source of funds where your organisation’s policy or risk profile calls for them.

For a wider view of how supplier categories fit together, the B2B influencer marketing tools and supplier guide for 2027 maps them against typical buying stages.

How do you test disclosure and content rights?

Ask for three live posts the agency ran last quarter, then read the labels yourself. UK rules require paid promotion to be obvious under the CAP Code, which the Advertising Standards Authority (ASA) administers and enforces, so a buried hashtag is a warning.

Then check the usage rights clause. Confirm the licence period, the territories and whether a creator's clip can run in paid media without a further fee. Ask who holds the creator contract as well. If the agency subcontracts the creator, your licence may rest on a chain of agreements you have never seen.

If the answer is vague, price the risk. A team paying £6,000 a month for content, for example, may need a separate paid usage budget.

What should you check on data and measurement?

Under UK data protection rules, including the UK GDPR and Data Protection Act 2018, identify whether each party is a controller, joint controller or processor for each data flow, and put the roles and instructions in writing. Check the supplier’s ICO data protection fee registration number on the Information Commissioner’s Office (ICO) public register, or document why it is exempt; this check is not proof of compliance. Ask where audience data is stored, who can access it and which party answers a subject access request. Request the retention period in writing, plus the name of the person who handles a breach notification.

Then test the measurement claim. Request a sample report with definitions for reach, engagement and pipeline influence. If a supplier reports one blended number, ask what sits inside it.

Directories help you compare providers on stated services. A review of Tikit Marketing Management shows the level of detail worth expecting from a listing before you shortlist.

Does public procurement change the checklist?

Yes, if a public body is buying. For procurements governed by the Procurement Act 2023, check the applicable tender documents and search Find a Tender; where relevant, also check Contracts Finder for opportunities in England. Earlier procurements may remain subject to the Public Contracts Regulations 2015, while Scottish public bodies use the Public Contracts (Scotland) Regulations 2015. The public procurement policy guidance applies when you hire an influencer marketing agency in that context.

Private buyers can borrow the discipline without the paperwork. Write the award criteria down first and score against them. That stops a favourite agency winning on presentation alone. Record why each shortlisted supplier passed or failed, and keep those notes with the contract file.

Which supplier fits which situation?

If you are still narrowing the shortlist, the B2B influencer marketing best tools in England compares platforms on the checks buyers actually run.

What belongs in the contract before signature?

Fix five things in writing: deliverables, dates, approval steps, payment triggers and termination. Add a clause on disclosure responsibility so it is clear who labels the post. Agree who pays for boosted posts on a creator's own channel, because that fee often sits outside the retainer.

Set a review point at 90 days with agreed evidence. If the supplier cannot show it, the review gives you a reason to renegotiate rather than argue. Name the notice period for termination and the fate of unused content after it ends.

Keep your own copy of every approval email. A dated file is the cheapest insurance in the engagement.

Common questions

How long should due diligence take?

For a small pilot, allow one to two weeks for entity checks, disclosure review and contract terms. Public sector buys take longer because the procurement route runs on its own timetable.

Do I need a lawyer to review the contract?

Not always. Get advice when the deal includes exclusivity, long usage rights or personal data sharing, because those clauses carry the most risk.

What is the biggest warning sign?

A supplier that resists putting deliverables, disclosure responsibility or termination in writing. Reluctance to document is the clearest signal to slow down.