Simon Smith and guests talk about the work that goes on behind the scenes of secret filming and the safeguards that need to be in place before filming even starts. With Su Pennington, head of editorial policy for BBC Factual programming, Jamie Rea, executive producer of Mark and Sam’s Big Friday Wind Up for CBBC, Jo Vaughan-Jones, series producer of Watchdog and Rogue Traders and Paul Kenyon, reporter of Kenyon Confronts and Panorama.