Written with the busy practitioner in mind, this concise and insightful book sets out the principles that guide the courts in interpreting contracts. Each principle is covered in its own dedicated chapter, supported by case law which illustrates how the principle works in practice and in its wider context. In addition to interpretation of contracts, the book also considers the implication of terms, rectification, and estoppel by convention. This new edition considers the implications of key decisions of the Supreme Court in Arnold v Britton and Marks & Spencer v BNP Paribas, and BNY Mellon v LBG Capital. Other writing, including from judges writing extra-judicially, is also analysed. This book provides an invaluable reference for lawyers drafting, interpreting and litigating on contracts.