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Andrew Arentsen’s practice is predominantly personal injury and clinical negligence, with the focus on high value and complex claims usually involving conflicting expert evidence.

It also includes professional negligence and he is highly regarded for his work on commercial and contractual disputes, including insurance issues and claims for subrogated recovery. He has a background in elite level sport and longstanding involvement in cases involving sports law and sporting disciplinary regulation. He is frequently instructed against leading counsel.

Andrew Arentsen is known for his impressive representation of claimants and defendants in spinal, catastrophic and closed head injury litigation. He specialises in claims involving highly complex medical issues, such as neurological, orthopaedic or psychiatric disputes. He is ranked as a Leading Junior in London and Wales for Personal Injury and Clinical Negligence in the leading legal directories.

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Personal Injury

Personal Injury work has a particular focus on catastrophic, spinal and closed head injuries. These include cases of employers’ liability, occupiers’ liability and road traffic accidents. Specialist advice is offered in claims with conflicting, complex medical evidence for example with orthopaedic, neurological or psychiatric disputes or where pain disorders are challenged. Work is divided between Claimant and Defendant and includes extensive experience at trial and in a pre-trial advisory capacity of industrial disease litigation (including group actions) in the form of deafness, asbestosis, dermatitis, WRULD and HAVS. He is very experienced in cases of NIHL of all types and had extensive involvement in test litigation where the applicability or otherwise of the Coles Lutman Guidelines to BT engineers exposed to tonal noise is being addressed. The acute difficulties of cases involving exposure to asbestos with mesothelioma are regularly and sensitively addressed as are the problems presented litigating high value cases worth over one million.

Clinical Negligence

An experienced Clinical Negligence practitioner conducting work both for Claimants and for Defendant trusts across the full range of claims including injuries caused at birth, negligent surgical procedures and a full range of cases of mis-diagnosis and failure to diagnose. He regularly advises and presents cases involving the late diagnosis of cancer.

Professional Negligence

Work includes cases of professional negligence with solicitors, architects and surveyors. 

Insurance & Property Damage

Specialist advice is offered in respect of insurance policies and recoverability issues as well as complex cases revolving around the construction, maintenance and management of sewerage systems. Andrew is highly regarded for his work on insurance and subrogated recovery claims. He has undertaken and has continued to undertake numerous claims for insurers to recover for domestic and commercial property damage paid out to their insured.  Subrogated insurance claims for insurers, will usually involving expert engineering evidence.

Instructions include fire damage claims with faulty electrical equipment such as tumble dryers, dishwashers and washing machines. They have also included faulty heating systems, faulty boilers, faulty electrical wiring and even a rogue running machine. A very recent case involved the ignition of soft materials from commercial laundry. Andrew has conducted many other property damage cases with damage caused by other faults other than fire. For example, construction work where construction machinery has malfunctioned and caused significant adjacent damage and where support equipment has failed causing massive damage on a construction site. Andrew has pursued a number of claims that relate to damage by trees to and diminution of value to property. All have involved expert engineering evidence.

Engineering evidence has often been disputed, leading to drafting  Part 35 questions and joint agendas for expert engineers. He has excellent experience cross-examining engineering evidence at trial.

Recent cases include: 

Turner v Electrolux Ltd. Andrew acted for a home insurer in a subrogated claim worth in the region of £300k. A fire had been caused at the house as result of a defective dishwasher. The fire caused extensive damage to the subject property and an adjacent garage. The issues were the cause of the fire and whether the dishwasher was proven to be sub-standard and of an unsatisfactory quality. The claim settled at a mediation. 

P and Co Ltd v Tibard Commercial Laundries. Andrew drafted proceedings in a claim for extensive fire damage caused by the negligent operation of a commercial laundry. The case, w hich is ongoing, is worth circa £500k. The issues are the negligence of the laundry staff and the rules of subrogated claims in landlord and tenant cases. There are restrictions on recovery which depend upon the analysis of the insurance policy and the tenancy agreement. 

Sport

With a background in elite level sport as a first-class rugby player, he is also highly regarded for cases involving sports law and sporting disciplinary regulation. He has extensive experience of sports disciplinary regulation including the supervision and administration of sports clubs by governing bodies

He was the author of an Independent review commissioned by a leading sports governing body into the licensing of its league clubs and it’s liabilities for the condition of their premises. He sits as the Chairman of the Welsh Rugby Union Independent Tribunal to consider foreign player work permit applications. The Panel has sat approximately 5 times each season. He has also acted as Panel Counsel to the British Boxing Board of Control Limited and was Panel Counsel to the Australian Rugby Football Union and the Georgia Rugby Football Union for the 2010 and 2012 tours.

International & Travel

Andrew has particular experience of cases involving the application of the Package Travel Regulations and Article 17(1) of the 1999 Montreal Convention. He has undertaken many cases of serious injury in consequence of accidents whilst abroad.

Notable cases

Education and Qualifications

  • Inns of Court School of Law (1994 – 1995).
  • MA Law Upper Second. Corpus Christi College, Cambridge University (1991 – 1994).
  • Cardiff High School (1983 – 1990).

Appointments & Memberships

  • Chairman of the Welsh Rugby Union Independent Tribunal (2008 – present).
  • Tier 1 Panel Counsel to the Welsh Government for personal injury.
  • Panel Counsel to the British Boxing Board of Control Limited.
  • Panel Counsel to the Australian Rugby Football Union and the Georgia Rugby Football Union for their 2010 and 2012 tours.
  • Company, Commercial and Clinical Negligence tutor on the Cardiff University Bar Vocational course (1999 – 2007).

Personal Interests

Andrew is a father of 3 children, all now living away studying at University.

He is a keen skier and cyclist. He cycled in 2012 from Yosemite to San Francisco as part of the Velindre Cancer Charity Cycle that raised over £500,000 for cancer services at the Velindre Centre in Cardiff. He was then persuaded to complete the second Velindre Cancer Cycle from Boston to New York in September 2014 which raised close to £750,000.

He has completed the 2009, 2022, 2023 and 2024 stages of the Etape du Tour. Each is a 120 mile mountain stage of the Tour de France. In 2025, he completed the Giro Lombardia in Lake Como in Italy.

He is a former first class, professional rugby player for Richmond, Newport and Glamorgan Wanderers. He was an U18 schoolboy international and a Cambridge Rugby Union Blue in 1993.

To instruct Andrew Arentsen or obtain more information

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Our clerking team, led by Chief Executive & Director of Clerking, Paul Cray, will be pleased to help with any enquiry regarding Andrew Arentsen, including suitability, availability, and fees. The team offers responsive, commercially focused, and highly professional support.

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