in which the reigning monarch (that is, the king or queen who is the head of state at any given time) does not make any open political decisions. All political decisions are taken by the government and Parliament. This constitutional state of affairs is the result of a long history of constraining and reducing the political power of the monarch, beginning with Magna Carta in 1215.

Since the start of Edward VII's reign in 1901, by convention, the prime minister has