The House of Lords yesterday debated the merits of the Counsellors of State Bill, which seeks to add Princess Anne and Prince Edward to the list of people that can act when the monarch is unable to do so. As Craig Prescott explains, this is a neat solution, but a temporary one.

The start of a new reign inevitably brings change to the monarchy. One specific change is that the monarch will once again travel overseas, including visits to some of the 14 other countries that also have a new head of state.

But what about the monarch’s constitutional and legal role while they are away? This role includes the granting of royal assent to legislation, appointment of ministers, ratification of treaties, and appointment of judges and diplomats. Many of these functions require the personal signature of the monarch (the royal sign manual), or in the case of holding Privy Council meetings and the state opening of parliament, their personal participation. This reflects how the monarch, as head of state, remains a central part of the UK’s constitutional arrangements. It is pivotal to the machinery of government that the royal authority is always available to grant the final, formal legal approval to wide range of decisions made by government and parliament.

The necessary continuity is provided by the Regency Act 1937, supplemented by the Regency Acts 1943 and 1953. If the monarch is overseas, or is unwell and unable to conduct their duties, Counsellors of State can be appointed to exercise the royal functions. During the reign of Elizabeth II, Counsellors of State were appointed over 100 times, facilitating the Queen’s extensive overseas travel and establishing her position on the international stage.

The Regency Acts provide that the Counsellors of State are the spouse of the monarch and the first four in the line of succession, of full age, domiciled in the UK. For the heir apparent or heir presumptive, the Regency Act 1943 allowed for then Princess Elizabeth to become a Counsellor of State when she became 18, otherwise ‘full age’ for these purposes is 21. The 1943 Act also allowed for any potential Counsellor of State to be excluded if they are overseas during the period of appointment. This provision was introduced so that Prince Henry, the Duke of Gloucester, would be excepted while Governor-General of Australia to prevent any potential conflict between that role and his position as a Counsellor of State.