Guidance on prisoners' in-possession property is contained in PSO 1250 (a copy of which is in the Library) dependent on the local incentives and earned privileges scheme. Prisoners may be allowed to have in their possession a personal music system. This is at the discretion of the Governor dependant on good behaviour under the local incentives and earned privileges scheme. There is no central guidance with regard to permissible volume levels. It is a matter for local management and the discretion of staff to ensure that music does not disturb other prisoners, especially at night.