Sourcing expert witnesses. Supplying medico legal reports.
Serving you, serving justice
With our hand-picked UK network of independent expert witnesses, HKA offers you a fast, hassle-free route to high-quality orthopaedic and psychological assessments.
Expert of The Month
A showcase of one of our experts

About the Expert
Dr Sarah Collett completed her Psychology with European Study degree at the University of Exeter; this included a year in France where she studied psychology at the Universite de Bourgogne in Dijon.
After assistant psychology posts with older adults and in a rehabilitation unit for adults with mental health problems, she embarked on her clinical psychology doctorate at the University of Plymouth.
Dr Collett chose to study psychology for its blend of scientific approach and human interest. She loves that clinical psychology gives the opportunity to build our understanding of and compassion for the human condition and promote positive mental health.
Since she qualified 2005, Dr Collett has lived in the beautiful city of Cardiff. She worked for 16 years in Community Mental Health Teams where she loved working therapeutically with adults with severe and enduring mental health problems.
Dr Collett has a particular interest in integrative and relational therapy models, and she is a qualified practitioner in Cognitive Analytic Therapy. Dr Collett also enjoys working with neurodiverse people, and valued working closely with colleagues in the Integrated Autism Service and gaining experience in autism assessment.
Dr Collett is passionate about clinical supervision and providing safe reflective spaces for her colleagues. She has enjoyed providing regular placements for trainee clinical psychologists throughout her career.
“Since 2021 I have worked 3 days a week in Maggie’s, a cancer support charity, providing free expert care and support for people with cancer and their families. It is an incredibly special place, and it is a privilege to be part of the team.
Outside work I love spending time with my family and friends. After being a bookworm as a child, I let the responsibilities of adult life (as well as some good television!) distract me from this hobby. However, I joined a book group a year ago and this has reignited my passion for reading and helped me to broaden my horizons. I also really appreciate my weekly yoga classes.”
Dr Collett will be providing clinics in Cardiff from March 2025.
HKA's expert witness directory covers 125 clinics across the UK, so it's easy to access them and get the psychological and orthopaedic report that you need. We hold every expert to the highest standards, so you'll always feel safe, comfortable and cared for.
For Solicitors
A faster way to find the right expert witness
Every expert in HKA's UK directory is independent, allowing you and your client to choose the required three expert witnesses all at one time. Be confident of finding the right expert witness for your case and receiving a detailed medico legal report without delay.
For Clients
A friendly expert close to your home
HKA's expert witness directory covers 125 clinics across England and Wales, so it's easy to access them and get the psychological and orthopaedic report that you need. We hold every expert to the highest standards, so you'll always feel safe, comfortable and cared for.
The HKA Quality Guarantee
- A dynamic in-house staff of 26, dedicated to personal service
- Medico legal instructions processed in-house within 24 hours
- Clinical psychologist and orthopaedic appointments confirmed within five days
- Clients typically seen by expert witness within 4-6 weeks of instruction
- Select an independent expert witness from our register of 42 experts
- Experts assessments performed at 125 UK clinics in England and Wales.
- Every clinical psychologist held to the highest HCPC/BPS standards
- Our orthopaedic surgeon held to the highest GMC standard
- Orthopaedic and psychological reports delivered two weeks after appointment
Testimonial: Agents & Solicitors
"The fees are very competitive for reports and there is a good spread of experts across the country. The staff seem very organised and are always very helpful. I shall continue to use this company and am happy with the service they provide."Catherine Thorkildsen, Absolute Medicals
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