Which rules apply depends on the certificate. In the UK, UKAS is the one national body that accredits certification bodies. It announced its first ISO 42001 accreditation, to BSI, on 15 January 2026. For Cyber Essentials, a certification body licensed by IASME checks whether you meet the requirements.
For an accredited ISO certificate, the two jobs sit with different organisations. If one group offers both, you can ask which company issues the certificate and under which accreditation. The guide to choosing an adviser covers the wider questions.
Who checks whom in accredited ISO certification
- UKAS the UK's national accreditation bodyaccredits
- A certification body audits you and issues the certificatecertifies
- Your organisation prepared by your own team or a consultant, never by the certification body itself
In short, UKAS ‘checks the checkers’.
How to get an accredited ISO 27001 or ISO 42001 certificate
- Ask your customer which certificate it wants, and whether it must come from an accredited body.
- Search the UKAS directory for the certification body, and check it is accredited for your exact standard.
- Keep the firm that prepares you separate from the body that audits you.
- If you use a consultant, ask who will do the work and which certificates past clients now hold.
- Plan for the full cost over time: the gap analysis, help to build the system, the audit, and later audits or renewals.
ISO 42001 and Cyber Essentials: common questions
How do we check a body is accredited for ISO 42001?
Search for the certification body by name on the UKAS directory. UKAS also shows the bodies accredited for ISO 42001 on its browse-by-category page.
Our certification body suggested a consultant. Is that allowed?
Yes. A certification body may give you a list of consultants. It must also tell you that using one will not make certification simpler, easier, faster or cheaper. The choice of consultant stays with you.
Does a UK government contract need Cyber Essentials?
A UK government contract often asks for Cyber Essentials. UK government policy applies to central government departments, their agencies and the public bodies they sponsor, and to NHS bodies. On contracts that handle personal data about citizens or government staff, they must check supplier security. Cyber Essentials or Cyber Essentials Plus is the quickest way to pass, and equal controls shown another way also count.
What does Cyber Essentials Plus add?
Cyber Essentials Plus adds testing by an outside assessor. It covers the same protections as Cyber Essentials, with more rigorous technical testing. Ask your customer which of the two the contract names.
Sources
- UKAS, checked 29 September 2026
- European Accreditation, checked 29 September 2026
- the NCSC, checked 29 September 2026
- UKAS news, checked 29 September 2026
- UKAS, checked 29 September 2026
- UKAS bulletin, checked 29 September 2026
- GOV.UK, checked 29 September 2026