“ Indeterminate sentences for public protection ("IPPs") were introduced with effect from4 April 2005 bysection 225 of the Criminal Justice Act 2003 . Essentially they were a new form of mandatory life sentence to be imposed upon conviction of any one of 153 specified categories of violent or sexual offences punishable by imprisonment for ten years or more if the court thought there to be a significant risk of serious harm to members of the public by the commission of further specified offences. Rapidly IPPs swamped the prison system with increasing numbers of life sentence prisoners (up from 5,807 on31 March 2005 to 10,911 on31 March 2008 ), many with comparatively short tariffs, all of which took the Ministry of Justice's National Offender Management Service (NOMS) by surprise. In the result, for much if not all of the time until14 July 2008 when section 225 came to be amended bysection 13 of the Criminal Justice and Immigration Act 2008 , NOMS were quite unable to give effect to the Secretary of State's published policy inPrison Service Order 4700 : to give all life sentence prisoners "every opportunity to demonstrate their safety for release at tariff expiry."”