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Greig is a commercial disputes lawyer focussing on insurance and professional negligence.

Greig is a solicitor advocate who assists clients in resolving commercial disputes by negotiation, ADR, litigation and arbitration. He specialises in insurance disputes, assisting policyholders, brokers, insurers and reinsurers on claims and coverage issues in relation to all types of insurance and reinsurance. 

He is highly experienced in advising clients on some of the largest and most complex insurance claims in the market, across many sectors, including financial institutions, energy, infrastructure, real estate, pharmaceuticals and hospitality. His experience extends across all types of insurance, with particular emphasis on management liability (D&O/POSI), cyber, crime/bankers blanket bond, civil liability (PI), property and business interruption, public and products liability and trade and credit risk. He also regularly advises clients on non-contentious matters such as policy drafting and review. 

He also advises in relation to a wide range of general commercial disputes in areas ranging from professional negligence to contractual disputes and restitutionary claims. His matters commonly have an international aspect. 

Greig is ranked in Legal 500 UK as a Leading Individual for Insurance Litigation for Policyholders and a Next Generation Partner for Insurance and Reinsurance Litigation.  He is also ranked in Chambers UK where he is described as "a highly astute and commercial operator, who is very responsive and user-friendly" as well as someone who "gives extremely good advice, he's very thorough and he's technically good."


Greig has a bachelor of laws (honours) degree from the University of Bristol. He qualified as a solicitor in 2006 and made partner in 2017.

Experience & expertise

Selected matters

  • the Financial Conduct Authority in its ground-breaking business interruption insurance test case for losses arising out of COVID-19, as well as various policyholders with COVID-19 claims
  • a financial institution on cyber, crime, civil liability and D&O claims arising from a major IT issue
  • Nord Stream AG on a €400 million insurance claim pursued in litigation for damage sustained to the Nord Stream 1 pipeline in September 2022
  • a UK bank on a D&O insurance claim in relation to shareholder litigation, thought to be one of the largest ever D&O recoveries 
  • a major manufacturer in relation to a complex financial loss and public liability insurance claim arising from sales of products
  • the claimants and a leading reinsurer in relation to a claim for recovery of property losses under the Riot (Damages) Act following a riot and fire at Yarl's Wood Immigration Detention Centre in 2002, including a successful appeal to the Court of Appeal on preliminary issues.