• Dr Siddaway particularly specialises in the areas of trauma/adversity and clinical risk and has expertise in working with children, adolescents, and adults

  • Expert witness assessments are conducted predominantly in Scotland (some in England) in the following areas: family law, personal injury, clinical negligence, and immigration. Assessments can be conducted in-person or online.

Dr Siddaway is Registered with the Health and Care Professions Council (HCPC) and Chartered by the British Psychological Society (BPS). He has worked in a range of NHS mental health services since 2004 and has extensive clinical experience assessing and treating children, adolescents, and adults experiencing a wide range of mental health problems. He 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 has attended the BPS’s Expert Witness training and is listed on the BPS Directory of Expert WitnessesHe works as an expert witness on family law, personal injury, clinical negligence, and immigration cases.

Dr Siddaway currently splits his time between NHS clinical practice as a Consultant Clinical Psychologist, expert witness assessments in civil and criminal cases, conducting and supervising research, and occasional 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.  


  • Psychological problems and responses related to trauma and adversity (e.g., trauma; adverse childhood experiences; neglect; abuse; domestic abuse; bereavement; human trafficking; accidents; immigration; chronic medical conditions)

  • 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 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

  • 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.