Six years after Brexit, the economic data tells a sobering story. Major economists increasingly point to a clear pattern: Britain's economy has underperformed relative to comparable developed nations. The evidence from trade statistics, investment flows, and GDP growth comparisons all point in the same direction—structural headwinds from the separation have created measurable drag on British economic output. Whether examining manufacturing exports, financial services competitiveness, or foreign direct investment trends, the picture remains consistent. The cumulative effect of regulatory divergence and trade friction has reshaped how businesses approach UK operations. As markets reassess the long-term implications of these policy shifts, the economic trajectory raises important questions about structural competitiveness and recovery pathways.