This report provides an analysis of leadership and management theory and practice within Sainsbury Plc, a major UK supermarket chain. It reflects on various leadership styles, concepts, and theories, including trait theory, great man theory, behavioral leadership theory, situational theory, and contingency theory. The report also discusses Katz's skills approach (technical, human, and conceptual skills), Michigan leadership studies, and the Ohio State model of leadership. A leadership development plan is included to highlight areas for personal improvement, focusing on decision-making, management, and time-management skills. The study concludes that effective leadership is crucial for organizational success and outlines how the discussed theories can be applied in a practical business setting.