This report provides a comprehensive analysis of organisational theory and practice within British American Tobacco (BAT) PLC. It examines the role of management styles, focusing on the leadership of CEO Mr. Jack Bowles and his implementation of democratic and situational leadership approaches. The report delves into the company's flat organisational structure and its impact on employee communication and decision-making. It further explores BAT's organisational culture, including the application of Handy's cultural dimension model, and its influence on employee behavior and performance. The analysis covers the effects of power, influence, and conflict within the company, and identifies the types of motivation used at BAT. The report also includes a literature review and concludes with recommendations for further improvement. This report aims to provide a detailed understanding of how organisational theory and practice contribute to BAT's business performance.