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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 (BSc (Hons); Clin.Psych; PhD; C.Psychol) is Registered with the Health and Care Professions Council (HCPC) and Chartered by the British Psychological Society (BPS). He attended the BPS’s Expert Witness training and is listed on the BPS Directory of Expert Witnesses. He 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 works as an expert witness on family law, personal injury, clinical negligence, and immigration cases and conducts fitness to work (Occupational Health) psychological assessments.


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

  • Parenting competence, family functioning, systemic dynamics, and 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 attempts, nonsuicidal self-injury/self-harm, sexual recidivism, harmful sexual behaviour, domestic abuse, intimate partner violence) – including capacity and motivation to change, protective factors, and recommendations for management/treatment

  • Assessment of mental capacity, fitness to plead, ability to give evidence and testify in Court, malingering, and suggestibility

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

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

  • 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 CV

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

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