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.
A paediatrician working for the NHS since June 2000, Gilbert had published research widely in all areas of paediatric nephrology. His involvement in the Inquiry stemmed from his treatment of a young child with a fatal level of salt in her body, and the subsequent media coverage. He told the Inquiry that a campaigner with a grudge against paediatricians had sought to destroy his career and that some newspapers had been happy to assist.