@WhiskersPete and others:
https://www.statista.com/statistics/863893/support-for-the-monarchy-in-britain-by-age/
Note the number don't knows in the stats breakdowns.
Elected heads of State... erm let's think: even recent history
i.e. WW2 onwards... Hitler, Mussolini, Stalin, Putin, Ethnic cleansing in Bosnia Herzegovina, Putin; less extreme but perhaps a tad unhinged: Trump, Johnson, Truss.... further East... hmm... where to begin ?9/11; Afghanistan, Ukraine, South Sudan.
By all accounts our unelected monarchs provide a good sounding board of checks and balances for many of our own former prime ministers' more outlandish ideas.
Worth reading some biographies and autobiographies of former pm's.
Interesting that the largest level of support for an elected head of state is amongst the youngest cohort in the stats, see link, some of whom may not even have great great, or great great great grandparents who lived or died during WW2 and who suffered countless losses of all sorts.
Memories are short, history teaching has changed...