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Mariusz Rumun

Call 2019


Mariusz welcomes instructions in commercial disputes, including the sale of goods, contracts for services, agency, bailment, and debt claims. He benefits from his experience specialising in commercial law during his Masters, graduating with Distinction and achieving the top mark in cohort in Commercial Remedies. He has explored in detail issues relevant both to litigation and international arbitration. Further, whilst working as a paralegal at a Magic Circle law firm before joining Chambers, Mariusz obtained hands-on experience of commercial disputes.

Examples of his work include:

  • Dublin Coach v Dawsongroup & Daimler Buses: Led by Daniel Shapiro KC, Mariusz is defending Daimler, the UK supplier of Mercedes coaches, in the Commercial Court.
  • Defending a supplier of excavators against contractual claims for breach of warranty following loss suffered by a third party following a fire in one of the excavators which had been let on hire-purchase terms.
  • Defending a removals company in a claim for damage caused to the Claimant’s property during removal, raising issues concerning the British Association of Removers Model Terms and Conditions.
  • Successfully resisting an application brought against a removals company by a litigant in person seeking judgment and a total freeze of the company’s accounts.
  • Defending a gratuitous bailment claim concerning the loss of valuables from a restaurant cloakroom. The matter included issues of breach of duty, reliance on disclaimers and the fairness of such disclaimers under the Consumer Rights Act 2015.
  • Successfully defending a claim brought by a litigant in person who claimed that the insurer had wrongfully retained her vehicle and sold it as scrap, despite having agreed and been paid a total loss valuation for the vehicle.
  • Advising on a claim concerning breach of a contractual warranty as to the quality and fitness for purpose of equipment supplied under a contract of hire. Issues also arose concerning a limitation clause in the contract and the application of UCTA 1977 (as a pupil).

Selected Cases

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  • Lord Denning Scholarship, Lincoln’s Inn (2018)
  • BPTC Advocacy Scholarship, BPP University (2018)




  • MA in Law, University of Cambridge, Downing College
  • LLM Commercial Law (Distinction), London School of Economics and Political Science
  • BPTC, BPP Law School


  • PNBA

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