You may only sit once she's nice and comfy, so keep a close eye on when the Queen sits down herself
While the Royal family may be extremely familiar to us, and while we may have our own nicknames for them, us common folk still aren't on a first name basis with them
The odds are you're probably never going to meet the Queen, sorry, but in case you do, remember the following:
Don't touch her
This rule dates back to Medieval times, when, as historian Kate Williams puts it, "monarchs were divinely appointed to rule by God, so they were kind of seen as gods, so they demanded to be treated as gods."
Happily, the notion of divine right of kings has eased up, but that doesn't mean you can go touching the Queen beyond a formal handshake.
Remember the raised eyebrows when, in 2009, Michelle Obama, put her arm around HM in a warm gesture?
Protocol experts sniffed VERY volubly at that.
While the same experts sniffed at Cleveland Cavaliers basketball star LeBron James putting his arm around the Duchess of Cambridge for a photo in 2014, a spokeswoman for the royal family James didn't violate any protocol, so maybe it's just the Queen.
Don't show up empty-handed
What do you get the woman who already has everything? Sure, the Queen has several homes full of priceless trinkets, but bringing a gift is a must, E! Online reports.
This gift must also be appropriate to the occasion. So if she's paying a visit to your hometown or country, something which reflects local culture might go down better than W.H. Smith's vouchers.
Stand to attention
You may be dead on your heavily-bunioned feet - but you should always stand when the Queen enters the room.
You may only sit once she's nice and comfy, so keep a close eye on when the Queen sits down herself.
Don't just twiddle your thumbs
When the Queen is making a beeline for you, or when you're next in the line to meet her, it's important you either bow or curtsy (depending on whether you're a woman or a man).
Don't ignore the dress code
Regardless of how late you're running or how tempting it is to stay in your onesie and slanket combo, make sure you dress accordingly when meeting HRH.
If the event is black tie, wear black tie.
Resist the temptation to refer to her by her first name
Or, heaven forbid, by a NICKNAME.
While the Royal family may be extremely familiar to us, and while we may have our own nicknames for them, us common folk still aren't on a first name basis with them.
So, when you first meet the Queen she should be addressed as "Your Majesty" and "Ma'am" consequently after. When she leaves, however, you must address her as "Your Majesty" once again.
No "Liz" or "Lizzie" or - shudder - "sweetheart".
Only speak if the Queen speaks to you
Remember when you were a small child and all your elders would drop wisdom such as "don't speak unless spoken to first" and "children should be seen and not heard"?
The same applies to meeting the Queen.
This rule exists so Her Royal Highness can control every aspect of the conversation - including exiting it swiftly.
Don't eat before she does
No matter how tasty and tempting the banquet morsels spread in front you look, you can only start eating once the Queen does.
So perhaps have a quick snack beforehand, in case any speeches go on for a long time.
Oh, and if she has finished eating, you better be full too.
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