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How to formally address british royalty and aristocracy in person
Greet royalty with a small bow or curtsy.
These are the most formal greetings, but they are never required, even for subjects of the queen. If you are a man and you choose this approach, bow your head slightly at the neck.
If you are a woman, : put your right foot behind your left, then briefly bend at the knees while keeping your upper body and neck vertical. Deep curtsies are not a faux pas, but they are uncommon and difficult to do gracefully.