There is no mandatory code of conduct to follow when greeting kings, according to the family website. However, it does say that some may choose to observe "traditional forms".
Basically, this means that the queen does not expect people to bow to her, although, nevertheless, many people do. For men, this may be a gentle lowering of the head, while women may opt for a slight bow. You can also add a handshake (if she offers first) But, anyway, the secret is not to overdo it.
In a meeting with the queen, tradition says she should speak first. In response, the correct form is to first address her as "Your Majesty" before moving on to "The Lady." Whatever you do, do not use her name!
Although royal protocols have relaxed in recent years, a key piece of advice is to "get suggestion" from the queen. If she walks, you follow; if she sits down, you sit down too; and if dinner is included, wait for her to start eating it first.
What to avoid
Do not be late. According to Debrett, the principal authority of British etiquette, "everyone should arrive before the royal personality and the rules of protocol indicate that no guest should leave an event in front of a member of the royal family, except in special circumstances when prior permission" . If you need to go outside, make sure you seek permission through a private secretary first.
This is understandable, but for sure: Do not touch the queen without her consent. She starts every contact - and this contact is at most a handshake.
So when did you leave the meeting?
Source: CNN