Why was Britain concerned about France's defeat by Germany at the end of the 19th century?

Britain was concerned about France's defeat by Germany at the end of the 19th century because it altered the balance of power in Europe, leading to a stronger Germany that could threaten British interests and naval supremacy. The rise of a unified Germany increased tensions and instability in the region, prompting Britain to reconsider its alliances and military strategies. Additionally, a victorious Germany could inspire nationalism and militarism in other countries, potentially destabilizing the continent further and challenging Britain's global empire.