This dissertation project investigates the relationship between board diversity, specifically gender diversity, and firm performance within the context of the United Kingdom. The study aims to determine if gender diversity enhances firm performance, increases the independence of board members, and if there is a correlation between duality (CEO also being the Chairman) and firm performance. The research employs both primary and secondary data collection methods, including surveys and analysis of financial data from UK companies, particularly those with 200+ employees. The research questions explore the impact of gender diversity on firm value/performance, the effect of gender diversity on board member independence, the potential impact of the Sarbanes-Oxley Act (SOX), and the influence of CEO duality. The research includes hypothesis testing, literature review, research methodology, data findings, analysis, discussion, and conclusion, providing recommendations for UK firms to improve board diversity and achieve competitive advantages. The study's findings will contribute to the understanding of corporate governance and its impact on business outcomes.