According to IPTechBlog,
In a modern world of celebrity and influencer endorsements, there is arguably one endorsement that still trumps others: the Royal Warrant.
…the 620 royal warrants granted by Queen Elizabeth II became void immediately upon the death of the Her Majesty on 8 September 2022. However, warrant holders have a grace period of two years during which they may continue to use the Royal Arms on their products, packaging, website etc.
After this time the insignia will either need to be removed or, in the event that a new grantor grants a replacement warrant, updated.
To read the entire article in IPTechBlog, please click here.