Cyber Essentials requires you to encrypt every hard drive in your organisation.
What is actually true
Cyber Essentials does not mandate full-disk encryption on every device. Under v3.3, encryption is effectively expected on end-user devices that leave the office perimeter (laptops, phones) - achieved via BitLocker on Windows and FileVault on macOS. Servers and desktops that stay inside a controlled office network are not explicitly required to be encrypted by the scheme itself, though many organisations encrypt them anyway.