Relating to the Post Office Horizon IT scandal, the Justice Committee are scrutinising the Government's proposed legislation to quash the convictions of sub-postmasters. The Committee are hearing from legal experts on the legal effects and constitutional implications of the Post Office (Horizon System) Offences Bill. Witnesses: Joshua Rozenberg KC (Hon), journalist Dr Robert Craig, Lecturer in Law, University of Bristol Dr Hannah Quirk, Reader in Criminal law, King’s College London Professor James Chalmers, Regius Professor of Law, University of Glasgow