How to tell a trustworthy review of video marketing agencies

What to take away

What a review methodology should assess

A method can be checked even when you never see it in action. Start with what it looked at, what it admits it did not look at, and how old each item is.

The evidence a reviewer can actually gather

A method should name its sources: published case studies, Companies House filings, the ASA ruling archive, platform documentation, and any agency contracts or rate cards shared. Where the review is a listing platform such as Clutch or Trustpilot, it should say how ratings are collected, who can leave one and whether agencies can pay to be featured. It should also name the code it measured claims against — in the UK that is the CAP Code, administered by the Committee of Advertising Practice and enforced by the ASA, which covers websites, paid search, social posts and most other non-broadcast advertising.

It should also state what was not assessed: no site visits, no staff interviews, no test campaigns. That boundary is not a weakness; it tells you where to run your own checks.

Dates matter as much as sources. A ruling from 2019 and a rate card from last quarter tell you different things. A sound method timestamps every item and treats anything older than two years as background rather than proof.

Where media buying is part of the service, the IAB UK Gold Standard sets the certification standard for supply chain transparency, and its list of certified companies is public. A review that ignores it leaves out a real risk area for any brand spending on programmatic or social inventory.

Separating claims from evidence and judgement

Three columns work well: what the agency says, what independent sources show, and what the reviewer concluded. For example, an agency may claim "award-winning creative". The independent column checks the public archives — D&AD, the British Arrows and the IPA Effectiveness Awards all list their winners — against the campaign and year named. The judgement column can then say the claim is unverified rather than false, and note that awards entries are self-submitted and usually carry an entry fee, so a win is evidence of a submission, not of a result.

This separation matters because past rulings are public and searchable. The ASA rulings archive publishes the complaint and the outcome for every case it upheld. Search it by advertiser name and by sector, read the upheld rulings rather than the resolved ones, and apply the same two-year cut-off the method uses elsewhere, so an old ruling does not stand in for current practice. A method that treats an upheld ruling the same as a marketing claim is not a method at all.

Judgement should also be labelled. When a reviewer writes that a showreel feels dated, that is an opinion, and the method should say so rather than dress it up as a measured finding.

Disclosure, sponsorship and paid rankings

A trustworthy method tells you how the site makes its money. Look for the disclosure line — "contains affiliate links", "sponsored", "paid partnership" — and check whether the ranking order matches the order of the links; if it does, the ranking is being sold rather than measured.

A worked example

Take a typical ranking of "the best video marketing agencies in the UK". The headline promises a comparison, so hold it to that promise: does it name every agency on the list, with a website and a named contact for each? Does it carry a publication date and a last-updated date?

Then trace the claims. Each statement should point to something you can open — a Companies House filing, a case study with a measured outcome, an award win you can find in the D&AD or British Arrows archive, an IAB UK Gold Standard listing. The CAP Code and the ASA ruling archive cover the compliance side: check whether the publisher or the agency has an upheld ruling. Anything that cannot be traced to a named source belongs in the claims column, not the evidence column.

How to apply the method to a shortlist

Reading a method is one thing; using it to choose between agencies is another. Work through the scores, adjust them to your brief, then put the gaps to the agencies themselves.

Turning scores into a decision

Scores are only useful if you know how they were built. Ask the reviewer which categories carry the most weight and why. If creative quality is weighted heavily but your brief is performance-led, the ranking may not match your needs. Adjust the weights to your own priorities before you shortlist.

Re-weighting is not cheating. A method is a tool, and the same evidence can point to different shortlists for a tourism brand and a software firm. Write the weights down before you score anything, so a later change of mind is visible.

Agencies differ by region and by sector focus, so a single national ranking hides a lot. A shortlist built on regional evidence will not look like a national table, and for most briefs that is a point in its favour.

Questions to put to the agency

Take the method's gaps and turn them into questions. Ask for recent campaigns with measured outcomes, not just views. Ask who owns the media supply chain and whether they are listed on the IAB UK Gold Standard register. Ask whether any of the agency's own advertising has led to an upheld ASA ruling, and what the agency changed afterwards.

Sector context helps, but keep it in its place. ONS tourism industry data shows which visitor-facing sectors are growing, which is useful when you judge whether an agency's claimed sector expertise is in a market that is actually expanding — but it tells you nothing about the quality of the review or the agency, so it should never lift a score on its own.

Common questions

These are the questions that come up most often when a shortlist is being judged on someone else's method.

Does a review methodology replace my own due diligence?

No. It narrows the shortlist and shows where evidence is thin. You still need to check contracts, insurance and references yourself.

Why do reviewers refuse to claim hands-on testing?

Because it would be untrue. A method built on documents, public records and interviews is honest about its limits, and you can repeat the checks.

How should vendor claims be treated in a score?

As claims, not evidence. They can raise a question for the agency, but they should not lift a score unless an independent source supports them.

What if the method leaves out compliance entirely?

Treat that as a warning. Advertising rules and media supply chain standards affect real spend, so a method that skips them is incomplete.