A wag once said that Queen Elizabeth can do anything she chooses to – once!! While smart-alecky, there’s a point to it. The Queen has a wide range of prerogative powers, which she customarily only uses on the “advice” (instructions/orders) of her Government. There is nothing at all stopping her from using them at her own volition – except the idea that if she did something not popular among a consensus of the citizenry and among the majority of leaders, it would be the only time she was ever able to do it; a bill stripping her of that prerogative power would quickly become law. But holding that reserve of powers in her, to be exercised on “advice,” makes the British government extremely flexible.
Suppose GWB wanted a formal declaration of war against someone. He can’t do it; he has to convene Congress, which will consider a motion to do so, debate it, and pass it – maybe. Meanwhile whatever military advantage might have been gained by a quick and explicit declaration of war and acting rapidly in accordance with it, is lost. But it is the Queen who declares war, on the advice of the Cabinet; Parliament is merely apprised of the fact. After Pearl Harbor, the U.K. beat us to the draw in declaring war on Japan. To be sure, Queen and P.M. had better have the Commons in hand in doing so – but the fact remains that constitutionally it is her prerogative to declare war. Other, less bellicose examples might easily be found; that one came to mind owing to Churchill’s explanation of it in connection with describing the events leading up to Pearl Harbor.
So nearly always the Queen will act on the advice of the Government, not because she is merely a figurehead, but because that is how their system is structured – she becomes the actor of record for something decided by collaboration and compromise beforehand. And she may well have had a significant voice in resolving the issue in the way she formally announces; she takes seriously her job to be informed and counsel and warn her ministers, and she has 50 years of experience in Government, something no politician worth his salt quickly discards.
There are two things that she may do without formal “advice,” though always with informal advice and with a definite feel for what the Commons wants: appoint and dismiss the Prime Minister. Although ordinarily she will appoint as Prime Minister the man who heads the party with a majority in the Commons, or the chosen leader of a coalition that can put together a majority, and hence her “choice” is limited to one person, she does have the discretion of calling anyone she believes can form a Government and requesting him to attempt to do so. She would do this if an effective three-way tie among Tories, Labour, and LibDems happened after next month’s election, identifying who might possibly be able to structure a coalition and calling on him to do so. Twice, in 1957 and 1963, she chose the new P.M. when the Conservative Party leader had to resign and there was no consensus replacement waiting in the wings. And while the P.M. ordinarily resigns when defeated on a vote of confidence or having lost an election, if he decided to play stubborn, she retains the right to fire him. And by precedent set by William IV and George V, the monarch is the one who makes the final decision whether to “pack the Lords” in order to get controversial legislation acted on. Under the Lords reform, this may fall into desuetude, but it’s worth noting as a case where the Queen acts at discretion rather than in strict accord with “advice.”
In short, the modern British system is founded on the idea of placing ultimate and emergency power in the hands of someone who may not ordinarily exercise it herself, but may choose whether to enable others to exercise it. A hypothetical P.M. struck by megalomania would be unable to cause a constitutional crisis, because the Queen would calmly refuse his advice and dismiss him.
The U.K. operates by cooperation and compromise among people who bring their differing views rather than by Hegelian conflict resolution, as the U.S. does. What the Queen does is not generally to be seen as “can she do it by herself?” in the same sense as what the President can and cannot do without Congressional authorization, but rather her role as spokesman for a behind-the-scenes consultation aimed at arriving at compromise and consensus, in which negotiations she may play a larger or smaller part.