The King and Queen sat at the head of the congregation in Antigua on Sunday for the first official engagement of the Commonwealth summit. The service marked both the "family of nations" and the 45th anniversary of Antigua and Barbuda's independence, which fell on the same day. Cricket's Sir Viv Richards and the prime minister, Gaston Browne, were among those present. The formal opening of the leaders' meeting follows on Monday. The speech everyone is waiting to parse is on Tuesday.

Anglican bishop Ernest Flemming, bishop of the North Eastern Caribbean and Aruba, told the King and Queen that prosperity in the Commonwealth had to be shared. Partnership, he said, was more than signed agreements. It required listening, fairness, and a place in real decisions for small states, young people, women, disabled people, indigenous communities and people at the margins.

"A genuine partnership does not ask what can I take; it asks what can we build together?"

That line will travel further than a Sunday sermon usually does. The official theme of this CHOGM is Accelerating Partnerships and Investment for a Prosperous Commonwealth. Caribbean governments have already said they heard Andy Burnham's offer of talks on a slavery apology, and his refusal of reparations, as the political weather around the King's words. The Palace said on Sunday that Tuesday's speech would meet the past with unflinching honesty and sincere sorrow.

What the host said on independence day

Browne's address to the nation welcomed the King and Queen and recalled that Antigua and Barbuda has remained a constitutional monarchy for 45 years, first under Elizabeth II and now under Charles III. He quoted Sir Vere Cornwall Bird, the independence prime minister, on being a former colony that was exploited and also a country to which Britain had contributed development. Browne said reparatory justice should be pursued with seriousness at this week's meetings, and without bitterness. He drew a distinction the London government will recognise: acknowledgement of a painful history, and a contemporary argument about restitution, held in the same week as a royal visit.

The Week in St John's

  • Sunday: service with the King and Queen. Antigua and Barbuda's 45th independence anniversary.
  • Monday: Commonwealth heads of government meeting gets under way. Theme: partnerships and investment.
  • Tuesday: the King addresses leaders. Palace: unflinching honesty, sincere sorrow, no UK policy.
  • Downing Street: open to discussing an apology. No reparations from today's taxpayers. Healey repeated that on Sunday.
  • The King remains head of state in Antigua and Barbuda, as he does in the Bahamas, which he visited last week. Guyana, the stop before this one, is a republic.

What Tuesday is for, and what it is not for

Buckingham Palace has been explicit. The King speaks as head of the Commonwealth, not as a minister. An apology, and any money, are for governments. A spokesperson said it would not be appropriate for him to address "matters of particular policy" after Burnham's comments, which the Palace was told about before they appeared. A senior aide described the King as practised on a diplomatic tightrope and ready to "bat for Britain", the realms and the wider Commonwealth. The speech, the Palace says, will dwell on practical cooperation among the 56 members.

That leaves a narrow path. Campaigners want the head of the Commonwealth to go further than any predecessor has gone on the monarchy's own historical links to enslavement. Ministers in London do not want a royal sentence that settles a question they have reserved. John Healey told Laura Kuenssberg that people in Britain now should not carry a financial liability for events of centuries ago. Browne's congregation heard a different emphasis: that the consequences have not disappeared, and that this meeting is a place to say so.

Why Monday still matters

Leaders do not need the King's text to start talking to each other. The apology offer is already on the table Burnham set on Friday. What changes on Tuesday is the sentence that will be clipped, shared and argued over in every member country. Until then, the images are of a church, a harbour, and a couple who spent Saturday resting after the King arrived late on Friday. The politics of the week have not rested. For readers following the royal tour from Greenwich, the useful distinction is simple. Sunday was hospitality and history in the same pew. Tuesday is the sentence. The decision stays in Downing Street.