Why was Britain concerned about France's defeat by Germany at the end of the Th 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, making Germany a dominant military force. This shift threatened British interests and security, as a powerful Germany could challenge British naval supremacy and colonial ambitions. Additionally, Britain feared that a united Germany could disrupt established alliances and lead to increased tensions, prompting a reevaluation of its own foreign policy and alliances.