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Niamh Kelly

Associate solicitor

Niamh is an associate solicitor in the international and group claims department

Competition law Group claims

Niamh is an associate solicitor in the international & group litigation department.  She is part of the competition team, where she focuses on complex competition claims brought on behalf of consumers.

This includes collective action claims against six water companies for allegedly abusing their dominant market position by underreporting the number of pollution incidents they cause, resulting in customers being overcharged. These are set to be the first ‘environmental’ collective actions in the Competition Appeal Tribunal.

Legal expertise

Prior to joining Leigh Day in April 2023, Niamh worked on a broad range of competition cases, including high-value, complex, multi-jurisdictional merger control procedures and high-profile antitrust investigations.  She also has experience advising on subsidy control and public procurement issues.

Niamh completed her training contract at Slaughter and May, qualifying into their Competition group in March 2022. She has a keen interest in sustainability and environmental issues, and is a member of UKELA.


Niamh holds a degree in Law with French Law from the University of Oxford, and spent a year studying at Université Panthéon Assas (Paris II)

Blog Post
Gel Nails
Consumer law Competition law Competition and markets authority

Nail technicians given competition law warning as they navigate routes to fair pay

Niamh Kelly and Rosio Cafarelli discuss what small business owners and consumers can learn from National Nail Price Increase Day.

Blog Post
Young Black Supermarket Worker
Consumer Competition law

Supermarket sustainability agreements –NGOs are reassured the risks to consumers are low

Niamh Kelly discusses recent guidance issued by the Competition and Markets Authority (CMA) on ‘sustainability agreements’, which must generate green benefits without hurting consumers.