The number of incidents in which two or more prisoners act together in defiance of a lawful instruction or against the requirements of the regime of the establishment. The act of indiscipline can be active or passive (i.e. involving aggression and violence or not) and the protagonists do not necessarily need to be acting in a common cause.
- Data is not always available for, or applicable to, every prison; and the list of prisons will vary year on year due to closures and newly opened establishments.
- Prison functions (Male Local etc.) refer to the function of the prison in the most recent year shown. The function of a prison may have been different in previous years.
- A small number of prisons which are listed separately in the above table are physically co-located and cannot be distinguished on the map.
- The markers on the map are indicative only. For further information on a prison, or for details of a prison's location, please consult the Ministry of Justice prison finder.