Agnieszka Szewczyk

Agnieszka is an associate in the firm’s London office. She is an experienced litigator, advising clients on all types of commercial disputes, including competition damages claims.

Agnieszka acts for clients in proceedings before the English courts and tribunals.  Notably, she currently represents Euronet, a leading payments services provider, in the High Court and Competition Appeal Tribunal in litigation against Visa and Mastercard regarding ATM fees.

Prior to joining Constantine Cannon LLP, Agnieszka worked at the leading legal 100 London-based law firms. She acted for clients in a wide variety of sectors, including acting for the claimants in a landmark class action brought against a giant financial institution for unpaid bonuses.

She has also advised clients regarding the mis-selling of financial products and undertook advocacy before the County Courts on behalf of her clients against UK banks.

Representative Matters

  • Acting for Euronet in litigation against Visa and Mastercard in the High Court and Competition Appeal Tribunal.
  • Acting for a London-based Hotelier Group in a winding-up petition in the High Court.
  • Acting for a high-net-worth client in a credit agreement challenge under the Consumer Credit Act, based on unfair relationship.
  • Acting for a high-net-worth client in a breach of contract claim, relying on a promissory estoppel defence.
  • Acting for London investment bankers against a German bank for unpaid bonuses.
  • Acting, and advocating, for a leading UK letting agent in repossession claims.


Agnieszka holds a Master’s Degree in Law from University of Wroclaw and a Graduate Diploma in Law from BPP School of Law.

Agnieszka speaks Polish fluently. She qualified as a solicitor in England and Wales in January 2018.

Featured posts

Agnieszka Szewczyk's Publications & Speeches

A List of the Big Technology Companies’ Multiple Antitrust Battles (For Those Who Have Lost Track)

The reasons why large digital technology firms sometimes cause concerns about unfair competition, and a summary of EU and UK investigations and litigation in response...

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