Any person who has an interest of three percent or more of the nominal value share capital of a public company has a duty to disclose that interest.
Every public company must keep a record of the person's name and the information disclosed. It must be at the same place as the register of the directors' interests.
This register must be made available for inspection by any person including non-member without charge. A copy of the register of interests in shares can be requested at a fee.
Concise Accountancy - Making company registers administration simple for businesses