Cyber Essentials is a self-assessment. A list of questions about the business IT security set-up. You’ll need to know things such as firewall rules, who has admin access, Cloud applications and if software and devices are up to date. Cyber Essentials Plus requires an IASME certified body to conduct a more in-depth audit and verify those answers.
https://datcom.co.uk/en/news/tech/show-youre-serious-about-security-with-cyber-essentials