As King Charles III prepares to address Commonwealth countries, Royal commentator Afua Hagan explores whether he will broach the issue of slavery that has long been a source of tension between former colonial powers and their former colonies.

The monarch will attend the Commonwealth Heads of Government Meeting, where climate change will feature heavily, but Britain won't raise the issue of reparations for the empire's historic slavery practice.

King Charles III arrived in Samoa on Wednesday to preside over the gathering of Commonwealth presidents and prime ministers for the first time as head of the monarchy.