It was to avoid confusion, because the Queen Mother was a Queen Elizabeth as well, and when George VI died there couldn’t be two Queen Elizabeths, especially as the new one was going to be Queen Elizabeth II, which would have been confusing because she came after, so it was probably just a spur of the moment thing because they were like, ‘FUCK WHAT DO WE CALL YOU NOW?’
Personally I think they should have made Charles take the regnal name ‘Queen Elizabeth’ just to keep it going. King Queen Elizabeth. Or the Queen Son.
I think the Queen Mother came up with the name herself, so if it makes no sense that’s why
The King Daddy
Big Pappa Phil