A Commonwealth realm is a sovereign state within the Commonwealth that has Charles III as its monarch and head of state.
https://en.wikipedia.org/wiki/Commonwealth_realm

St Kitts and Nevis, Independence Day September 19th, 1983
https://www.gov.kn/

Hutt River was pre 1973, under the Government of the Commonwealth of Australia. His documents indicate “it would be unconstitutional not to grant Hutt River” independence. Post 1973 though, it surely is still unconstitutional not to grant independence?

Hutt River Province website

https://www.principality-hutt-river.com/gov/PHR_Historic_Secession_Documents.htm