News Temporary closure of HMP Dartmoor Due to high levels of radon gas recorded at HMP Dartmoor, all prisoners gradually moved out in 2024 , whilst it is being decided how the situation will be rectified. We have temporarily relocated our headquarters and editing suite to an office in the community. This has not affected our editing and production service for our member prisons ( currently 102 prisons nationwide). Updates on GOV.UK Manage Cookie Preferences