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Mariusz Rumun

Call 2019

Professional Liability

Mariusz has experience of professional liability claims and issues across a variety of different professions including auctioneers, insurance brokers, managing agents, solicitors, architects and other construction professionals.

Examples of Mariusz’s work include:

 Insurance Brokers

  • Drafting the Defence to a claim against an insurance broker alleging a failure to effect insurance to cover loss of rent and legal expenses in connection with a commercial property portfolio.


  • Representing a firm of solicitors in a £100,000+ claim following the payment of conveyancing money directly to the beneficiary under a discretionary trust, it being alleged that it should have been paid into an account in the name of the trust.
  • Representing solicitors in a loss of a chance claim, the claimant having discontinued her product liability claim on the advice of her new representatives, allegedly caused by negligence the defendant firm in their choice of defendants and pleaded causes of action.
  • Drafting the Defence to a claim brought against a solicitor alleging breach of undertaking and breach of trust in connection with their involvement in the proposed purchase a commercial property.
  • Preparing an advice and drafting Particulars of Claim in a claim against a firm of solicitors with regards to its involvement in a fraudulently obtained bridging loan secured by a charge on the claimant’s property (as a pupil).
  • Preparing an advice on the liability of a firm of solicitors following the sale of a property under a fraudulently executed power of attorney, raising issues of breach of duty, breach of trust, breach of undertaking, and breach of warranty of authority (as a pupil).
  • Assisted in preparing advice on the merits of pursuing a rectification claim (for either unilateral or common mistake) following the exclusion of a section of land from a transfer, which left the purchased land landlocked (as a pupil).

 Construction Professionals

  • Represented a firm of architects in an adjudication concerning allegedly negligent design and contract administration of concrete works as part of the development of a new tram terminal.
  • Advising engineers consulting on design aspects of a major development as to the contractual and tortious duties owed by them in connection with issues of defective design and delay (as a pupil).


  • Drafting the Defence and advising in relation to a High Court claim brought against letting agents following a failed attempt by a landlord to obtain possession of a property by way of a notice under section 21 of the Housing Act 1998.
  • Drafting the Defence and advising in a claim brought against an auctioneer of real estate in a claim concerning the information contained in the auction catalogue.
  • Drafting the Defence to a claim arising out of the answers provided by the defendant to enquiries contained in a CON29 Drainage and Water Report.

Selected Cases

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



  • BPTC (Very Competent), BPP Law School
  • LLM Commercial Law (Distinction), London School of Economics and Political Science
  • BA (Hons) Law (2.1), University of Cambridge, Downing College

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