Martyn Day > Leigh Day > London, England > Lawyer Profile

Leigh Day
27 Goswell Road
Martyn Day photo

Work Department

Personal injury, group actions.


Martyn Day is the senior partner at Leigh Day. He has a leading reputation for international, product liability and environmental claims, often as group actions. He heads a team of lawyers who represent claimants in the UK and overseas in cases against corporate or governmental bodies.


Trained Colombotti & Partners; qualified 1981; Clifford & Co; Bindham & Partners; founded Leigh Day & Co with Sarah Leigh OBE 1987. Publications include: co-author ‘Personal Injury Handbook’, ‘Toxic Torts’, ‘Multi-Party Actions’ and ‘Environmental Action: a Citizen’s Guide’; in 2004 co-authored a report with WWF and the Environmental Law Foundation entitled ‘Environmental Justice’. Regularly addresses lectures, seminars and media on environmental and justice issues.


Former chair, Chem Trust; former chair, Greenpeace UK, now board member, Greenpeace Environmental Trust.


Playing tennis, watching Arsenal, getting out to the theatre as often as time allows.

Lawyer Rankings

London > Real estate > Environment

(Hall of Fame)

Martyn DayLeigh Day

With a strong claimant-focused practice, Leigh Day is described as ‘flexible, fearless and fantastic’, representing local communities from the Global South in multi-party actions against large corporations while also handling biodiversity, climate change and planning issues in its domestic practice. The firm aims to change the legal landscape and has achieved significant judgments regarding corporate accountability, particularly when it comes to subsidiaries’ activities abroad. International department head Richard Meeran, whose ‘breadth and depth of expertise is unrivalled‘, leads the practice together with Jamie Beagent, who is experienced in planning-related environmental issues. Martyn Day continues to be a name of note, leading on some of the practice’s most high-profile claims. The team’s partnership ranks have grown to include Paul Dowling, who was promoted in April 2021 and is active in international human rights, personal injury and environmental cases.

London > Insurance > Personal injury: claimant

Leigh Day‘s ‘truly unique‘ practice ‘takes on cases others would not touch and uses them to advance the law and break new ground‘; this willingness to handle ground-breaking litigation was illustrated most recently by the firm’s involvement with the landmark case of Swift v Carpenter. Sally Moore, who is described by a client as ‘one of the strongest lawyers in the field‘, leads the personal injury department, while Daniel Easton and Harminder Bains jointly head up the dedicated industrial disease team. Richard Meeran oversees the international work which is such a cornerstone of the practice, and for which renowned practitioners Martyn Day and Sapna Malik are particularly recommended.