Vicarious Liability in Institutional Abuse Claims: Key Considerations for Psychiatric SJE Reports

In the evolving landscape of institutional abuse litigation, vicarious liability remains central to establishing accountability. Recent authorities such as Mohamud v WM Morrison Supermarkets plc [2016] UKSC 11, Barclays Bank plc v Various Claimants [2020] UKSC 13, and Armes v Nottinghamshire County Council [2017] UKSC 60 have refined the legal tests governing institutional liability for employee or associate misconduct. Psychiatric Single Joint Experts (SJEs) must ensure their reports align with these frameworks, particularly in claims involving schools, care homes, religious institutions, or other organisational settings.

This article examines the clinical and legal intersections psychiatric experts must navigate when preparing SJE reports for vicarious liability cases. It provides guidance for legal practitioners handling group litigation, Criminal Injuries Compensation Authority (CICA) matters, or individual claims where institutional accountability is disputed.

Clinical Context: Trauma and Institutional Abuse

Institutional abuse claims often involve survivors presenting with complex trauma sequelae. Under ICD-11, Complex Post-Traumatic Stress Disorder (CPTSD) is characterised by core PTSD symptoms—re-experiencing, avoidance, and hyperarousal—alongside disturbances in self-organisation, including emotional dysregulation, negative self-concept, and relational difficulties. These symptoms may be compounded by the betrayal of trust inherent in institutional settings, where abuse was perpetrated by figures in positions of authority.

For child claimants, developmental trauma may manifest as attachment disruption, consistent with Bowlby’s attachment theory and Ainsworth’s Strange Situation paradigm. Adverse Childhood Experiences (ACEs) research highlights the long-term psychological and physiological impacts of institutional abuse, including heightened risks of depression, anxiety, dissociative disorders, and somatic symptoms. In historic abuse claims, delayed disclosure is well-documented, supported by clinical evidence on betrayal trauma theory and the neurobiology of memory suppression.

Psychiatric experts should also assess systemic failures that may have enabled abuse. For example, the Armes decision underscored the duty of care owed to children in foster placements. Reports should evaluate not only individual harm but also institutional conditions that facilitated or failed to prevent the alleged abuse.

Legal Relevance: Vicarious Liability Tests and Psychiatric Evidence

The modern test for vicarious liability, as established in Mohamud and refined in Barclays Bank, requires the court to consider two key questions:

• Is there a relationship between the wrongdoer and the institution capable of giving rise to vicarious liability? This may involve assessing whether the perpetrator was an employee, independent contractor, or otherwise integrated into the institution’s operations.
• Is there a sufficient connection between that relationship and the wrongful act to make it fair, just, and reasonable to impose liability? This involves examining the context of the abuse, including the perpetrator’s role, the institution’s control over their activities, and whether the abuse arose from a position of authority.

Psychiatric SJE reports must address these questions indirectly by providing evidence on:

• The nature and severity of psychological harm, which may inform the court’s assessment of the “fair, just, and reasonable” threshold.
• Institutional dynamics that enabled the abuse, such as safeguarding failures, supervision gaps, or reporting deficiencies.
• The claimant’s presentation in the context of the alleged abuse, including delayed disclosure, memory fragmentation, or trauma-related symptoms that may affect credibility or causation.
• The long-term impact of the abuse, relevant to quantum and the institution’s responsibility for ongoing harm.

In Various Claimants v Barclays Bank, the Supreme Court clarified that vicarious liability is not limited to employer-employee relationships but may extend to other relationships where the institution exercises significant control. This has implications for claims involving religious institutions, sports clubs, or voluntary organisations. Psychiatric experts should comment on institutional culture and whether it created an environment conducive to abuse.

Common Challenges in Psychiatric Evidence

Several issues frequently arise in vicarious liability claims where psychiatric evidence is contested:

Diagnostic Overreach or Understatement

Experts may overstate the link between abuse and symptoms, particularly where pre-existing vulnerabilities or subsequent life events exist. Conversely, understatement may occur if the expert fails to recognise the cumulative impact of institutional betrayal. A trauma-informed assessment should include a thorough developmental history, psychometric testing (e.g., International Trauma Questionnaire for CPTSD, PCL-5 for PTSD), and consideration of differential diagnoses.

Causation and Apportionment

In cases involving multiple perpetrators or institutions, experts may be asked to apportion harm. For example, where a claimant was abused in both a care home and a school, the expert must clarify which symptoms are attributable to each setting. This requires a nuanced understanding of trauma sequelae and the specific dynamics of each institutional environment.

Limitation Arguments

In historic abuse claims, defendants may argue that the claim is statute-barred under the Limitation Act 1980. Psychiatric evidence can be pivotal in Section 33 applications, particularly where delayed disclosure is a factor. Experts should explain clinical reasons for disclosure delays, such as shame, fear of reprisal, or memory suppression, and how these align with the claimant’s presentation. Authorities such as A v Hoare [2008] UKHL 6 and RE v GE [2015] EWCA Civ 287 provide guidance on the court’s approach.

Malingering and Symptom Validity

Defendants may raise concerns about symptom exaggeration or fabrication, particularly in high-value claims. Psychiatric experts should use validated tools such as the Structured Inventory of Malingered Symptomatology (SIMS) or the Minnesota Multiphasic Personality Inventory-2-Restructured Form (MMPI-2-RF) to assess symptom validity. However, these tools must be used cautiously in trauma populations, as genuine trauma symptoms may overlap with validity scales. A trauma-informed approach prioritises clinical judgement over rigid psychometric cut-offs.

Complex Trauma Presentations

General personal injury assessments may overlook the nuances of complex trauma, leading to misdiagnosis or underestimation of harm. For example, a claimant with CPTSD may present with chronic emotional dysregulation, self-harm, or relational instability, which may not fit neatly into a PTSD diagnosis. Experts should be familiar with ICD-11 and DSM-5 criteria for trauma-related disorders and explain their application to the claimant’s presentation.

Role of the Psychiatric Expert Witness

The psychiatric SJE report in a vicarious liability claim must fulfil several key functions:

• Diagnostic Clarity: Provide a clear, evidence-based diagnosis (or differential diagnosis) under ICD-11 or DSM-5, referencing the alleged abuse as a potential causative factor.
• Causation: Assess the link between the alleged abuse and the claimant’s symptoms, considering pre-existing vulnerabilities, subsequent life events, and the institutional context. This may involve apportioning harm where multiple perpetrators or settings are involved.
• Institutional Accountability: Comment on institutional failures that enabled the abuse, such as inadequate safeguarding policies, lack of supervision, or cultural factors that discouraged reporting. This may involve reviewing institutional records, safeguarding reports, or witness statements.
• Prognosis and Treatment Needs: Outline the claimant’s likely recovery trajectory, including ongoing therapy, medication, or care needs. This is particularly relevant to quantum and future loss calculations.
• Trauma-Informed Methodology: Demonstrate an understanding of trauma-specific assessment techniques, such as phased interviewing, avoidance of retraumatisation, and the use of validated psychometric tools. The report should explain how the expert’s methodology aligns with best practice in abuse injury medico-legal work.

In group litigation, the SJE report may also need to address common themes across multiple claimants, such as systemic failures or patterns of abuse. Experts should be prepared to provide both individual and collective assessments where appropriate.

Practical Guidance for Solicitors

For solicitors instructing psychiatric experts in vicarious liability claims, the following considerations are critical:

When to Instruct

Early instruction of a trauma-specialist expert is advisable, particularly where:

• The claim involves complex trauma presentations, such as CPTSD or dissociative disorders.
• There are limitation issues, and the expert’s evidence may support a Section 33 application.
• The claimant is a child or vulnerable adult, requiring a paediatric or capacity assessment under the Mental Capacity Act 2005.
• The case involves group litigation, and the expert’s evidence may inform common issues.

Records to Provide

The expert will require a comprehensive set of records, including:

• Medical records (GP, psychiatric, hospital).
• Educational or care records (for child claimants).
• Institutional records (safeguarding reports, disciplinary records, training logs).
• Police or social services reports (where available).
• Previous expert reports or witness statements.
• Therapy notes (with the claimant’s consent).

In historic abuse claims, records may be incomplete or lost. The expert should comment on the impact of missing records on their assessment.

Preparing the Claimant for Assessment

Trauma-informed assessments require sensitivity to the claimant’s emotional state. Solicitors should:

• Explain the purpose of the assessment and what to expect, using clear, non-technical language.
• Offer the claimant a choice of expert gender, where possible, to minimise distress.
• Ensure the assessment environment is safe and private, with breaks offered as needed.
• Provide the option of a support person or intermediary, particularly for vulnerable claimants.
• Clarify that the claimant is not obliged to discuss the abuse in graphic detail unless they feel comfortable doing so.

Red Flags to Raise with the Expert

Solicitors should discuss the following issues with the expert before instruction:

• Diagnostic Uncertainty: Where the claimant’s presentation is atypical or complex, ask the expert to explain their diagnostic reasoning and any differential diagnoses considered.
• Causation Challenges: If there are competing explanations for the claimant’s symptoms (e.g., pre-existing mental health conditions), ask the expert to address these explicitly in their report.
• Institutional Failures: Request that the expert comments on systemic issues that may have contributed to the abuse, such as lack of training, inadequate supervision, or cultural factors.
• Prognosis: Ask the expert to provide a realistic assessment of the claimant’s recovery trajectory, including barriers to improvement (e.g., ongoing litigation stress, lack of access to therapy).
• Quantum Considerations: Where the claim involves significant future losses (e.g., therapy costs, loss of earnings), ask the expert to outline the claimant’s likely care and treatment needs over the long term.

Multi-Disciplinary Input

In complex cases, a multi-disciplinary approach may strengthen the evidence. For example:

• A paediatrician may assess physical abuse indicators or developmental delays in child claimants.
• A clinical psychologist may conduct psychometric testing to assess symptom validity or cognitive functioning.
• A psychiatrist may provide a diagnostic assessment and treatment recommendations.

Where multiple experts are instructed, their reports should be consistent and complementary. Solicitors should ensure collaboration where necessary, particularly on issues of causation or prognosis.

Conclusion: Aligning Psychiatric Evidence with Legal Tests

Vicarious liability in institutional abuse claims hinges on the court’s assessment of the relationship between the perpetrator and the institution, and the connection between that relationship and the wrongful act. Psychiatric SJE reports play a pivotal role by providing clinical evidence on the nature and impact of the abuse, institutional failures that enabled it, and the long-term harm suffered by the claimant.

For legal practitioners, instructing a trauma-informed expert with experience in abuse injury claims is essential to ensure the psychiatric evidence aligns with the legal tests for vicarious liability. This is particularly critical in group litigation, where systemic failures may be in dispute, or in historic abuse claims, where limitation and causation arguments are likely to arise.

Early instruction, clear communication, and a focus on the institutional context will strengthen the evidence and support the claimant’s pursuit of accountability and redress.