Earlier quoted context omitted.
The king/queen can dissolve parliament: https://en.m.wikipedia.org/wiki/Royal_prerogative_in_the_Uni... It is only by convention that he doesn't, that will only last until you get a bad king/queen and thr right opportunity.
It's only by convention that Parliament doesn't chop the King's head off. I would imagine that convention will last approximately the same amount of time.
https://www.wikipedia.org/wiki/Ex_post_facto_law
Just get that fixed as well, that's not a great thing to have around.