20 June News Expert Evidence and The Post Office Horizon IT Inquiry Post Office Horizon IT Inquiry, Post Office Scandal, Jason Coyne, 05. Rules and Regulations, 10. Report Writing, 14. Giving Oral Evidence, Kay Linnell, Gareth Jenkins The Post Office Horizon IT Inquiry is currently holding the public hearings for its phases 5 and 6, which will include scrutiny of the expert evidence relied on by the Post Office. We are proud that two members of EWI provided excellent, independent expert evidence or expert advice on the Horizon case. Their roles in the case demonstrate how important it is for Expert Witnesses to understand and apply the core competencies of the profession.