Psychiatric conditions are complex. People who have mental health challenges are classed as vulnerable and therefore require special care and treatment so that they do not harm themselves and are not exposed to harm by others. Mental health care is expensive. Treatment of psychiatric ill health requires funding, time and expertise and unfortunately all three are in short supply. NHS mental health services are underfunded and understaffed which means that patients can fail to get the level of care and support they need both in hospitals, primary care settings and in the community. When mental health patients are not well cared for and monitored, avoidable harm can occur. Legal issues arising from shortcomings can mean regulatory investigations, service complaints, performance concerns, inquests and tricky medicolegal, ethical or hypothetical scenarios. Where a claim is brought for negligence, the claimant will have to show that their care was such that they suffered foreseeable injury as a result of a breach of duty. Even where a breach of duty is established, establishing the counter-factual through