The Fixed-term Parliaments Act, which entered into force in 2011, introduced completely new regulations on the dissolution of Parliament and the duration of its mandate. It repealed the royal prerogative under which the queen, on the advice of the Prime Minister, had the power to dissolve Parliament at any time, which would ultimately lead to parliamentary elections. Despite the introduction of a fixed parliamentary term, constitutional practice, in particular the precedents of 2017 and 2019, have shown that the fundamental objectives of the new act, i.e. to ensure the stability of governments and to prevent the Prime Minister’s manipulation of the election date for political gain, can be easily undermined. This article attempts to analyze and evaluate the functioning to date of the Fixed-term Parliaments Act 2011 in the UK constitutional system and to examine the possible implications of repealing the Act for the functioning of the UK Constitution.