We are seeing cases of people being arrested in UK for holding #NotMyKing signs or something along these lines. My question here is not about the legality of those police actions.
My question is: as a UK citizen opposed to monarchy, do I have any legal obligation of differential treatment towards the king/queen if I stumble upon them on the pavement or can I treat them exactly like any other ordinary citizen? In a purposefully exaggerated way for the sake of clarification, a law that states something like "you must address the king as 'your highness' or you will be arrested", or "thou shalt vacate thy seat if the king enters the bus".