Hero Image

Sion Wynne

Senior Clinical Negligence Solicitor

Sion is a Team Leader and Senior Solicitor with 30 years’ experience dealing with a wide range of medical specialisms and different types of injuries. He is an experienced Medical Negligence Solicitor and manages a team of lawyers within our department.   


Sion joined Fletchers in 2018 as a Team Leader in the Medical Negligence department. Throughout his 30-year legal career, he has specialised in conducting medical negligence claims on behalf of claimants, previously working for other highly-ranked leading firms in the field. 

He has undertaken claims covering the full spectrum of medical specialisms, clinical settings, categories of defendant and types of negligent medical care and treatment. 
These include high value and complex maximum severity cases, such as those involving limb amputations and permanent neurological injuries. 

Sion is experienced at representing bereaved families at inquests and has a particular interest in fatal accident claims.

Notable Settled Cases

JI v Warrington and Halton Hospitals NHS Trust

£1.25m recovered for client left paraplegic after spinal anaesthesia.

RS v Central Manchester University Hospitals NHS Foundation Trust

£150,000 recovered for client in respect of a failure to recognise complications after a kidney transplant, where her father was the donor.


£100,000 recovered for a client who suffered two years of persistent pain and disability after knee replacement surgery undertaken as a private patient.

CS v Penine Acute Hospitals NHS Trust

£400,000 recovered for a child who sustained Erb’s Palsy during her delivery.

(Deceased) v Central Manchester University Hospitals NHS Foundation Trust

£450,000 recovered for the family of the deceased who died as a result of a delay in diagnosing a brain tumour.


  • Accredited mediator with the ADR Group
  • Senior Litigator of the Association of Personal Injury Lawyers for over 10 years
  • Former member of the Law Society’s Clinical Negligence Panel for 15 years

Special Interests