What is a constitutional convention?

Ah, quite so sir, a constitutional convention is not always written into law, but it is a practice or tradition that has become so well-established over time that it is treated as if it were. In many countries, including the United Kingdom, such conventions guide how government functions, for example, the Prime Minister usually being the leader of the majority party in Parliament. These customs help maintain order and stability within the political system, even when they are not formally legislated.