This report provides a detailed analysis of Marks & Spencer's business strategy. It begins with an introduction to business strategy and then proceeds to analyze the macro-environment using PESTLE analysis, evaluating political, economic, social, technological, legal, and environmental factors influencing the company. The internal environment and capabilities are then assessed through a SWOT analysis and VRIO analysis to determine the company's strengths, weaknesses, opportunities, and threats, as well as its valuable, rare, inimitable, and organizationally supported resources. The report then applies Porter's Five Forces model to assess the competitive landscape, including the bargaining power of buyers and suppliers, the threat of new entrants and substitutes, and the rivalry among existing firms. Finally, the report applies various theories, concepts, and models, including the Ansoff matrix, to devise a strategic plan for Marks & Spencer, focusing on market penetration. The report concludes with a strategic plan outlining the company's vision and mission.