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.

The King, who is head of the Commonwealth, is due to formally open the Commonwealth Heads of Government Meeting.