Without UKAS accreditation,
a slip test is just an opinion.

What UKAS actually is

UKAS is the sole body recognised by the UK government under the Accreditation Regulations 2009 to assess and accredit testing, calibration and inspection bodies. It's not a trade association. It's not a membership scheme you pay to join. It's a statutory body that audits laboratories against ISO/IEC 17025 — the international standard for testing laboratory competence.

A UKAS accredited laboratory has been independently verified as competent to perform specific tests using specific methods on specific equipment. The accreditation is scope-specific: a lab accredited for concrete testing is not accredited for slip testing. When you commission a slip test, you want the provider accredited for pendulum slip resistance testing to BS EN 16165 — and nothing else is equivalent.

The UKAS test for slip testing providers

Why non-accredited slip tests fail

A pendulum tester is a commercial product. Anyone can buy one. Anyone can press the release lever and read the pointer. What ISO/IEC 17025 accreditation verifies — and what non-accredited operators can't demonstrate — is the entire chain of operational competence that sits behind producing a defensible PTV number:

• Equipment calibration. The pendulum must be calibrated against traceable reference standards on a defined schedule. UKAS labs have calibration certificates and a calibration routine the auditor has reviewed. Non-accredited operators may have neither.
• Technician competence. UKAS accredited technicians are assessed annually against documented competence criteria. A non-accredited technician's "competence" is self-declared.
• Method validation. UKAS labs have written, auditable method statements for every test in their scope. When the lab uses BS EN 16165 Annex C, they've validated their specific application of that method. Non-accredited operators may follow "the standard" in name but deviate in ways that invalidate the result.
• Slider selection and conditioning. The Four-S rubber slider must be prepared, conditioned and discarded according to UKSRG Guidelines Issue 6. A non-accredited lab often uses the same slider beyond its valid life.
• Uncertainty quantification. Accredited reports state measurement uncertainty — the plus-or-minus confidence interval around the PTV. Courts and insurers care about this. Non-accredited reports usually don't include it because the lab can't calculate it.
• Traceable report numbering. UKAS reports carry sequential IDs traceable to the original field notes and calibration records. Non-accredited reports can be issued and later modified without any traceable audit trail.

What happens when you use non-accredited evidence

Four scenarios play out regularly:

Scenario 1 — Personal injury claim

A claimant slips, sues, and the defendant produces a non-accredited slip test report showing "compliant" PTV. Claimant's solicitor obtains their own UKAS accredited test, which shows different results. At trial, the defendant's evidence is excluded or given no weight. The defendant pays.

Scenario 2 — HSE inspection

Post-RIDDOR investigation, the HSE inspector asks for slip resistance evidence. The facility manager produces a non-accredited report. The HSE treats it as absence of evidence and proceeds on the assumption the surface is non-compliant. Improvement notice issued.

Scenario 3 — Section 41 Highways Act

A pedestrian falls on a local authority-managed surface. The council's Section 58 defence requires documented maintenance evidence. Non-accredited testing doesn't meet the evidential bar. The court accepts the claim. Council pays.

Scenario 4 — Specification acceptance

A new-build contractor provides non-accredited pendulum results at practical completion. The employer's representative rejects them and requires independent UKAS testing before signing off the works. Programme delay. Retention withheld.

UKAS vs. other slip testing claims

Several labels sound reassuring but aren't equivalent to UKAS accreditation. Being aware of the difference is the first step:

Claim	What it actually means	Equivalent to UKAS?
ISO 9001 certified	Quality management system certification. Says nothing about technical competence.	No
UKSRG member	Paying member of the UK Slip Resistance Group. Not an assessment of testing capability.	No
"UKAS traceable"	Meaningless phrase often used to imply accreditation without having it.	No
"Tested to BS EN 16165"	Self-declared compliance with the standard. Not independently verified.	No
UKAS accredited laboratory	Actually accredited by UKAS under ISO/IEC 17025 for the specific test scope.	Yes

How to verify our accreditation (in 60 seconds)

1. Go to ukas.com and use the "Find an Accredited Organisation" search
2. Search by accreditation number 7933 or by name "Surface Performance"
3. Confirm the entry shows UKAS Testing Laboratory 7933, Surface Performance Ltd, located at Unit 16 Vicarage Farm, Sunbury-on-Thames
4. Download the linked schedule of accreditation PDF and confirm slip resistance testing is in-scope

You can do this for any UK testing laboratory. If their number doesn't produce a result on ukas.com, they aren't accredited — regardless of what their website says.