The role of warranties in marine insurance has sparked debate in recent years and there have been calls for reform of this area of the law. This book sets out the current law on marine insurance warranties. It further looks at the position on warranties through the wider perspective of how the defence of breach of warranty fits into the scheme of the other major defences the marine insurer may have under a marine policy. Whether there is any justification for calls for reform is then considered. The law in other jurisdictions is assessed, before specific proposals for possible reforms are set out. At a time when there is a flurry of cases in the English courts on warranties, when the CMI is considering the law on marine insurance and other marine insurance markets may be growing at the expense of the London market, it would be well for all those involved in the London marine insurance market to consider the points made in this eminently readable and thought provoking book.