Still digging into the Joseph Gregory Hallett situation.

Long story short, he's the new King of England. He's got all the paperwork, he's got all the swords, and it looks like his identity was sufficiently proven.

He will take the throne as King John III.

QE2 has been ousted. https://twitter.com/mshaw555/status/1262771698195103744

"Dress down Thursday for the Queen as she opens parliament in casuals" Reports the Metro,

When a Queen or King has their title and honor taken away, they can only wear common clothes for public engagements. They can never be seen as heads of state again.

https://metro.co.uk/2019/12/19/queen-opens-parliament-second-time-weeks-promise-get-brexit-done-11932782/

This was further illustrated by QE2 being intentionally locked out Windsor Castle. It wasn't due to a faulty gate, the new resident changed the lock code.

QE2 will likely remain at Windsor Castle under "covid-19 quarantine" until the coronation. https://www.express.co.uk/news/royal/1252083/queen-elizabeth-ii-news-queen-car-queen-pictures-queen-windsor-castle-royal-news

Can anyone in London confirm the authenticity of this picture?

Buckingham Palace displays the seal of Joseph Gregory Hallett, King John III of England - dated 19th May 2020.