In March we introduced cohorting strategies, including the ‘compartmentalisation strategy’ across the estate, to isolate the sick, shield the vulnerable and quarantine new arrivals, based on advice from PHE. We are pleased to report that 100% of prisons have implemented compartmentalisation in full and modelling by PHE has supported its effectiveness at preventing explosive outbreaks and protecting the lives of staff, prisoners and young people. As part of the wider strategy, we also significantly reduced transfers between prisons and the cross-deployment of staff. Reducing movements between prisons has mitigated against the risk of importation and onward transmission in custodial settings.