Submitted in response to written requests from the Inquiry, usually providing lists of questions to be answered. In most cases these formed the basis of questioning in public sessions, but in some cases they were read into the record (or taken as read) and the witness did not appear in person.
Given by witnesses invited by the Inquiry, normally after they have made written statements. These sessions could be viewed live online and sometimes on television news services, and the video recordings are part of the archive. The statements were usually released to the public after the public sessions.
Detective Sergeant for the Metropolitan Police force, Williams had been involved in many operations within Organised Crime Group, Specialist Operations and Anti-Terrorism branches. He led the police inquiry into hacking allegations in 2006 and gave evidence to the Inquiry about the early investigations of Operation Caryatid and his interviews with Glenn Mulcaire, then of the News of the World.