If you were arguing that Britain is a monarchy only in title
The United KING_dom is a monarchy.
THE MONARCHY AND THE CONSTITUTION
By Alistair McConnachie and first published in a Sovereignty Special Report distributed free with the May 2002 issue.
Princess Elizabeth came to the throne on 6 February 1952 following the death of her father, George VI.
Her coronation took place in Westminster Abbey on 2 June 1953.
The British monarchy is the oldest and most fascinating monarchy on earth. It is almost impossible to consider British history without acknowledging the centrality of its monarchy, and it is almost impossible to imagine Britain without a monarchy.
In these articles we examine how the sovereign People, and the sovereign Queen, relate together within the sovereign Community of the Realm.
THE BRITISH CONSTITUTION
There are three areas of government -- the legislature, that is the law-making power, the executive, that is the law-enforcing power, and the judiciary, which determines the law.
For centuries the monarch exercised supreme executive, legislative and judicial power in person.
The struggle between Crown and Parliament in the seventeenth century led in 1688-89 to the establishment of a limited constitutional monarchy.
With the establishment of the Party system by the end of the nineteenth century, the monarch's direct role in politics became minimal.
Today, the two major roles of the Queen are as the Head of State and as a National Icon.
As Head of State the Queen does not owe her position to either patronage or a vote, and can more properly represent all the people in a way in which an elected President cannot.
As a National Icon, with a history stretching back centuries, the Queen is a distinct symbol of national identity. She represents Britain - the nation, its constituent parts, and the people - in a way in which a transitory politician can never do. In this role, she also provides a focused and tangible symbol of the people's sovereignty.
These are important roles, and in both of them she has political power - of a sort - but it is not the sort of power which by itself, could for example, take Britain out the EU.
Under our present system, the legislature is Parliament, namely, the House of Commons and the House of Lords. The executive is the Queen, the Prime Minister and the Cabinet.
There is some connection between the three branches of government. For example, the Cabinet links the legislature with the executive, through its members. The Lord Chancellor, who is a Cabinet member, links the judiciary and the executive, and the Lords of Appeal - "the Law Lords" - sitting in the House of Lords, link the legislature and the judiciary.
"The Crown" is the symbol, and name, of the supreme governing authority. The Queen is the person of the Crown.
The governing functions of the Crown are exercised by ministers responsible to Parliament, in the name of the Queen. Hence the term, "Her Majesty's Government".
Bills go through the House of Commons, and the House of Lords and when they have been passed by both Houses, the Queen gives her "Royal Assent" to them.