Which of the following is an example of democracy in the UK?

Citizens voting in elections is a fundamental example of democracy in the UK. This process allows individuals to participate directly in the political system by selecting representatives who will make decisions on their behalf. It embodies the principles of a democratic society, where the power of governance is derived from the consent of the governed. Voting provides citizens with the opportunity to express their preferences and influence the direction of their government, ensuring accountability and representation.

In contrast, the other options demonstrate elements that do not align with democratic practices. For instance, a government making laws without public input indicates a lack of transparency and a disregard for the views of its citizens, which contradicts democratic ideals. Mandatory service in the army involves compulsory enlistment, which does not reflect the voluntary and participatory nature of democracy. Lastly, the establishment of a monarchy pertains more to a hereditary system of governance rather than the democratic engagement of citizens in political processes.