Once upon a time, a beautiful, independent, self- assured princess happened upon a frog in a pond.  The frog said to the princess, “I was once a handsome prince until an evil witch put a spell on me. One kiss from you and I will turn back into a prince and then we can marry, move into the castle with my mother and you can prepare my meals, clean my clothes, bear my children and forever feel happy doing so.”  That night, while the princess dined on frog legs, she kept laughing and saying, “I don’t think so.”
Queen Elizabeth, as the current monarch of the United Kingdom, Canada, Australia and a host of other commonwealth countries that have her on their money, enjoys something known as sovereign immunity.  Or to put it another way, her majesty is, for all intents and purposes, above the law.  This means she can do whatever she likes and get off scot-free.  Here’s why:
The Queen Can’t Be Arrested – Elizabeth is the absolute authority over the entire British police force.  Every new officer swears an oath that says, “I will well and truly serve the Queen in the office of constable.”  Her word is literally law with every bobby throughout the land.  As a matter of fact, no arrest can be made in her presence, including her, without her permission.  So if the police came to take the Queen away, she could simply tell them no, now go away.
The Queen Can’t Be Tried – Elizabeth is the absolute authority over the entire British judicial system.  Both judges and lawyers of the Crown Court are given the post-nominal or after their name, QC (Queen’s Counsel).  This signifies that they are all serving as an extension of her will and thus why all cases brought before the Crown Court are tried as “The Crown (Queen) versus so-and-so” and require her signature to proceed.  So if someone came to put the Queen on trial, she could just tell them no, so get lost.
The Queen Can’t Be Jailed – Elizabeth is the absolute authority over the entire British penal system.  All prisoners held in jail in Great Britain are done so “at her Majesty’s leisure” (which is why the Queen can pardon any criminal at any time for any crime they’ve committed.).  So if someone came and put the Queen behind bars she could just turn around and walk out, telling everyone to let her go.
Now we know the current Queen would never do anything illegal that was worthy of prosecution, let alone refuse arrest, trial and jail.  But what about a future Monarchy?   Surely Parliament would step in and curtail these absolute powers.  The problem here is that all laws proposed by Parliament require what is known as Royal Ascent before they can be enshrined into British Law.  And as the name suggests, Royal Ascent must come directly from the King or Queen (and no notorious head of the royal family is going to allow a law to come into effect that will now let them be handcuffed, sentenced and imprisoned).  As well, even if Parliament did force them to abdicate the throne, under British law, nothing they did while King or Queen can be considered illegal.

It’s also worth noting that the King or Queen has the power to completely dissolve Parliament if he or she so chooses, causing a whole new set of people to be elected.  And if this group displeased them, they are free to do it again and again.  As well, the Monarch appoints the Prime Minister and they can put anyone in that position they want, regardless for whom  the British public voted.  So installing someone who would do what the King or Queen wanted politically would not be any real hurdle at all.
So in such a scenario it would literally take a revolution for Parliament to rewrite the laws concerning the Monarchy without the reigning royal’s consent.  But here there’s a problem as well.  For you see, the King or Queen is Commander-In-Chief of the British Armed Forces.  Like the police, every soldier swears an oath of allegiance to the Monarchy.   So, if there was an attempt at a Parliamentary revolution and members of Parliament refused to step down as they were re-writing British law without the Monarchy’s consent, the King or Queen could simply order the British Military to forcibly remove them from power (or even line them all up and have them executed).
Now I said all that to say this.  It may not happen in England’s future, but it has happened in Her past.  And time and space limits me from talking about other royal families, past and present, throughout the world.

The bottom line.  Every individual who has ever sat on an earthly throne (be they good or be they bad) needs to remember that this is the reason why at the endtime white throne judgment – Jesus Christ is not just called a king, but he is the King of kings (and queens).