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  • Personal injury, clinical negligence, immigration, family law, and Occupational Health expert witness assessments

  • Works across the lifespan: with children, adolescents, and adults

  • Expert witness assessments are conducted online or in-person in Scotland, northern England, and London

Dr Siddaway (Clin.Psych PhD CPsychol AFBPsS) is Registered with the Health and Care Professions Council (HCPC) and Chartered by the British Psychological Society (BPS). He is an Associate Fellow of the BPS and an Honorary Senior Clinical Lecturer at the University of Glasgow. He attended the BPS’s Expert Witness training, is listed on the BPS' Directory of Expert Witnessesand was recently appointed Chair of the BPS’ Expert Witness Advisory Group, which advises on professional standards and good practice for psychologists working as expert witnesses.

Dr Siddaway has worked in a range of NHS mental health services since 2004, including several specialist psychological trauma services and an Occupational Health service, and has extensive clinical experience assessing and treating children, adolescents, and adults experiencing a wide range of mental health problems. He splits his time between NHS clinical practice as a Consultant Clinical Psychologist, expert witness assessments, conducting and supervising research, and some private psychological therapy (see specific pages above for further information). He particularly specialises in the areas of trauma/adversity and risk (risk to self, risk to others, risk from others); he conducts research and offers consultation, teaching, training, and supervision to other mental health professionals on these areas.  


Dr Siddaway has worked as an expert witness Clinical Psychologist since 2017 and has developed a strong reputation for producing rigorous and accessible reports in complex cases. He conducts personal injury, clinical negligence, family law, and immigration expert witness assessments, as well as Occupational Health assessments. Dr Siddaway continues to tend to conduct expert witness assessments remotely; he considers the appropriateness of doing so on a case-by-case basis, in collaboration with instructing parties and client(s), taking account of any contraindications to remote assessment, particularly age and cognitive abilities, and always prioritising clinical need and ethical rights (click here for a summary of the evidence-base regarding remote psychological assessments and interventions and more details about when Dr Siddaway does and does not work remotely).


  • Psychological/psychiatric problems and responses to trauma and adversity in a broad range of populations

  • Mental health of children and parents, parenting competence, family functioning, systemic dynamics, risk to children (e.g., residency; contact arrangements; ability to make and sustain changes; parental alienation) 

  • Theory and evidence-based risk assessment and management across the lifespan (e.g., suicide risk, sexual recidivism, sexually harmful behaviour, domestic abuse, intimate partner violence) – including capacity and motivation to change, protective factors, and recommendations for management/treatment

  • Diagnosis of psychiatric disorders and personality disorders using gold standard semi-structured diagnostic interviews and clinical interview

  • Occupational health psychology assessments covering fitness to work, return to work, sickness absence

  • Psychological formulations of complex individual and systemic problems and suitability for psychological therapy

  • Neuropsychological assessment

Dr Siddaway is always happy to informally discuss potential cases and can assess and report with tight turnaround times if needed.


Expert witness psychologist CV

Please get in touch to discuss instructions and timescales. References and sample reports are available on request.

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