Recent limits to Royal prerogative powers

• Recent limits to the royal prerogative include that the prime minister should make major military commitments only 'on the advice and with the sanction of Parliament' A precedent was set, in the vote on the Iraq War, that Parliament, not the prime minister, has the final say on committing ground troops into military conflict
• Treaties that have been approved by Parliament can only be undone by Parliament, a fact confirmed by the UK Supreme Court's decisions relating to Brexit
• The Fixed-term Parliaments Act requires the prime minister to win supermajority in Parliament for an election to be called early While Boris Johnson was able eventually to hold an election in December 2019, the House of Commons initially blocked him from calling an election earlier on in that year