Some tips on how to speak like the Queen

        

         Video from BBC News. The Queen's advice on wearing a crown - BBC News.  (Youtube)

The Queen's speech is still regarded by many as the 'proper' way of speaking, and a marker of prestige and ability.

Some of the easiest ways to make your accent sound as high-class as the Queen's include clearly pronouncing the letter H at the beginning of words, such as "hat" and "happy," some say. Another tip is to practice saying "father" and "oh" with your mouth wide open, as if you are at the dentist.
The Queen may live in Buckingham Palace and wear tiaras on a regular basis, but you could argue that it's her accent that really shows how RP she is. Her Majesty rarely addresses the public, and yet her way of speaking is one of the things she is most known for, although her pronunciation has changed over time and sounds less "posh" than when she was crowned in the fifties.

The monarch speaks in British Received Pronunciation (RP), a speaking style that was adopted in the late eighteenth century among the upper classes. Using this speaking style might make people believe you're upper-class, even if you're not.The Queen's English is common among those who went to public schools, such as Eton, and elite universities such as Oxford and Cambridge. It was only until recently in the UK that university students, public figures, and TV and radio presenters were encouraged to comfortably use a broad range of accents. In the past, due to linguistic snobbery, many would have adjusted their accents to get ahead.

Many public figures — particularly royals — still use RP, as it's still regarded by many as the 'proper' way of speaking, and a marker of prestige and ability.

This was recently illustrated in a 2019 study by Yale University, which found that humans make snap judgments on people's accents in as few as seven words.

How to speak like the Queen in a few simple steps. If you want to learn how to sound  like the British monarch, follow the five key instructions below:

1. Clearly pronounce the letter H at the beginning of words such as "hat" and "happy."
2. Don't pronounce the R in a word unless it precedes a vowel. For instance, you wouldn't pronounce the R in "fortunately" but would pronounce it in words such as "brick" and "scratch." 
3. Make your vowels longer. Practice saying "father" and "oh" with your mouth wide open, as if you are at the dentist's.
4. Emphasize the letter T. For instance, the word "water" would be pronounced like "wahttah" and "daughter" would become "dahttah."
5. Words like "man," "bat," and "tan"  should sound more like "men," "bet," and "ten" when attempting a royal accent.
6. Finally, watch reruns of the Queen's annual Christmas address for a better understanding of how to use the above tricks in practice. 

Source: https://www.insider.com/how-to-speak-posh-like-queen-elizabeth-2020-9