LAWYER PROFILE
Martyn Day

Martyn Day

UK 2026

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Ranked in 5 practice areas

Contributions and articles

3 Articles, Press releases, highlights

About

Provided by Leigh Day

UK

Practice Areas

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.

Career

From Colombotti & Partners, moved to Clifford and Co., then went to Bindman & Partners. In 1987, set up Leigh Day with Sarah Leigh OBE.

Professional Memberships

Board member of Greenpeace Environmental Trust, Leadership Council Member of Earthrights International, Former Chair of the Chem Trust, Former Chair of Greenpeace UK

Publications

Martyn regularly addresses lectures, seminars and media on environmental and justice issues.

Chambers Review

Provided by Chambers

Chambers Guide to the Legal Profession

International Human Rights Law - UK-wide

Senior Statesperson
Senior Statespeople

Individual Editorial

Martyn Day is a renowned claimant lawyer, who brings an unmatched level of expertise to his broad domestic and international practice. He frequently represents marginalised workers who have suffered human rights abuses abroad.

Civil Liberties & Human Rights - UK-wide

Senior Statesperson
Senior Statespeople

Individual Editorial

Martyn Day is a renowned claimant lawyer, who brings an unmatched level of expertise to his broad domestic and international practice. He frequently represents marginalised workers who have suffered human rights abuses abroad.

Personal Injury: Mainly Claimant - London (Firms)

Senior Statesperson
Senior Statespeople

Individual Editorial

Martyn Day is celebrated for his pioneering personal injury practice, pursuing claims arising out of injuries sustained both at home and overseas against corporations and government bodies. His areas of expertise include misconduct by the military, environmental pollution and historic rights violations.

Group Litigation: Claimant - UK-wide

Senior Statesperson
Senior Statespeople

Individual Editorial

Co-founder of the firm Martyn Day is renowned for acting on landmark group litigation, often with human rights, product liability or environmental elements. He represents thousands of claimants against large companies including British American Tobacco and VW.

Environment: Claimant - UK-wide

Senior Statesperson
Senior Statespeople

Individual Editorial

Martyn Day is widely acclaimed for his expert handling of multiparty actions against major corporations. He has a wealth of experience representing foreign nationals in environmental cases.

Strengths

Provided by Chambers

  • Martyn Day is the doyen of this area of law.

    International Human Rights LawChambers Guide to the Legal Profession
  • He is very well-known in this space.

    International Human Rights LawChambers Guide to the Legal Profession
  • Martyn is a legendary figure.

    Personal Injury: Mainly ClaimantChambers Guide to the Legal Profession
  • Martyn has a good eye for what is a good point and a bad point. His charisma and his reputation in this area are second to none.

    Group Litigation: ClaimantChambers Guide to the Legal Profession
  • Nobody does it better. I always learn something from him and he is amazing to work with.

    Environment: ClaimantChambers Guide to the Legal Profession
  • Martyn Day really knows his stuff. He is the strategic lawyer who sticks out.

    Environment: ClaimantChambers Guide to the Legal Profession

Ranked Individuals at Leigh Day (93)

London (Firms)

North West

UK-wide

Articles, Highlights and Press Releases

3 items provided by Leigh Day

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