This book explores the application of foreign law in civil proceedings in the British and German courts. It focuses on how domestic procedural law impacts on the application of choice of law rules in domestic courts. It engages with questions involved in the investigation and determination of foreign law as they affect the law of England and Wales, Scotland, and Germany. Although the relevant jurisdictions are the focus, the comparative analysis extends to explore examples from other jurisdictions, including relevant international and European conventions. Ambitious in scope, it expertly tracks the development of the law and looks at possible future reforms.