Plumb
A

UK consumer product testing

Which?

Consumers' Association (registered charity No. 296072); commercial arm Which? Limited

Hands-on tester Paywalled Visit Which? ↗

A rare reviewer that buys and lab-tests products itself, takes no ads, and by its own disclosure keeps paid logo-licensing walled off from its ratings.

What it's really for A member-funded UK testing nonprofit; the verdicts sit behind a paid subscription.

What our grade covers The grade on this page is about its lab-tested 'Best Buy' product verdicts, not everything the site does.

High Scoring Confidence Checked against primary sources. We are confident in the facts and the grade here.

Follow the money

Paying members fund most of the work; separately, rated brands pay to license endorsement logos, but Which? states paying companies "are not treated any differently when it comes to editorial decisions."

Source →
Operating since
1957 (69 years) · source
What it costs you
Paywalled You have to pay or subscribe before you can read the reviews.
How they make money
A nonprofit-owned subsidiary funded mainly by paid member subscriptions, plus affiliate commissions and fees brands pay to license its "Best Buy"/"Recommended Provider" endorsement logos.
What they do
Which? independently buys, lab-tests and rates consumer products and services (electronics, appliances, financial products, insurance, travel) and publishes Best Buy and Recommended Provider verdicts behind a paid subscription.
What to watch for
Brands it rates well can pay a fee to slap the "Best Buy" logo on their packaging and Which? earns affiliate commissions on outbound links, so its independence rests on its own firewall and disclosures rather than on having no commercial ties at all.
Composite score
4.40 / 5.00 → grade A

How the grade was reached

Independence · 30% weight 4 / 5

Does the site take money from the very entities it ranks? Pay-for-placement, vendor-funded data, and affiliate commissions all pull this down. The less the ranking can be bought, the higher the score.

Evidence basis · 30% weight 5 / 5

What is the ranking actually built on? Hands-on testing scores highest, then verified first-hand reviews, then opinion or popularity surveys and self-reported figures, then pay-to-rank, which scores lowest.

Method transparency · 20% weight 4 / 5

Is the methodology published, specific, and reproducible? Can a reader see how a given rank was reached, or is it a black box?

Conflict disclosure · 10% weight 4 / 5

Are commercial relationships, sponsorships, and affiliate arrangements disclosed clearly and near the rankings themselves, rather than buried?

Manipulation resistance · 10% weight 5 / 5

How hard is it to game? Controls against fake reviews, solicited reviews, and vendor gaming raise this; an open box anyone can stuff lowers it.

Evidence

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