The extent of mixed sex psychiatric intensive care in the UK: a service description

National discussions in the UK are progressing toward the elimination of mixed–sex psychiatric intensive care units (PICUs), with a national position statement on single–sex provision expected in 2026 and potential implementation around 2029. This brief report provides an updated overview of current PICU configuration across the UK to inform planning for this transition. Data were collated from NHS trusts and independent providers on the number of mixed–sex PICUs and the potential impact on patients. In 2025, 50 of 110 PICU wards (45%) operated as mixed–sex units, with all NHS PICUs in Scotland, Wales and Northern Ireland falling into this category. In England, 71% of PICUs were single–sex, although provision was disproportionately weighted toward male wards, and female PICU capacity was limited and unevenly distributed, with some regions having no female PICUs. Mixed–sex wards accounted for 468 beds, and estimates suggest that approximately 328 male and 140 female patients may be affected by a move to single–sex provision. These findings highlight significant regional inequities and the likelihood of increased out–of–area placements for women unless female PICU capacity is expanded. The report provides a timely baseline to support national service redesign and underscores the need for coordinated commissioning to ensure safe, equitable, and locally accessible single–sex PICU care.