The system in England and Wales for the protection of prisoners' rights relies on three institutions: a prisons inspectorate with right of entry to all prisons at any time, a prisons and probation ombudsman, and local independent monitoring boards. This contribution focuses on the Prisons Inspectorate and discusses its methodology and criteria for inspection, based on international human rights standards; the effectiveness of the inspectorate; its independence and relationships with other monitoring bodies, the government and the prison service; the application of the methodology to other countries outside the UK; and future developments and threats. © Springer Science + Business Media B.V. 2006.