As well as Head of State, the monarch is also head of the Anglican Church and head of the armed forces. In these roles Liz was the nation's comfort blanket.

I don't know how far Charlie will take the 'defender of faiths' schtick:

https://www.dumptheguardian.com/uk-news/2022/sep/09/king-charles-to-be-defender-of-the-faith-but-also-a-defender-of-faiths?amp;amp;amp

Not too far, I'd guess. Wouldn't want to upset the gammonati.