The UK “can’t change our history”, Prime Minister Sir Keir Starmer has told the BBC when asked about paying reparations to countries impacted by the transatlantic slave trade.

His comments come after diplomatic sources told the BBC that Commonwealth heads of government want to start a “meaningful conversation” about an issue that could mean the UK paying billions of pounds for its historical role in the trade.

Chancellor Rachel Reeves ruled out making payments, in an interview earlier on Thursday, saying “that’s not something that this government is doing”.

Sir Keir, who is currently in Samoa for a meeting of Commonwealth countries, said the trade was “abhorrent” and that it was important to “talk about our history”.

However, he added that the focus should be on “today’s challenges” including resilience in the face of climate change and boosting trade between Commonwealth nations.

He added he wanted to help member countries work with international financial institutions to “unlock money that might help them” in relation to climate change.

Leaders from 56 countries are attending the Commonwealth Heads of Government Meeting taking place in Samoa on Friday and Saturday.

Commonwealth leaders are expected to defy the UK and debate ways of securing reparations for historical slavery. At its height, Britain was the world’s biggest slave-trading nation. Downing Street has the issue is not on the agenda for the summit.

Reparatory justice for slavery can come in many forms, including financial reparations, debt relief, an official apology, educational programmes, building museums, economic support, and public health assistance.

In the run-up to the summit, there have been growing calls from Commonwealth leaders for the UK to apologise and make reparations.

King Charles will formally open the summit and is expected to use his opening speech to pay tribute to his mother the late Queen Elizabeth II and her connection to the Commonwealth.

He will also say the Commonwealth’s scale and diversity allows it to “discuss the most challenging issues with openness and respect”.

During the gathering, a new Commonwealth secretary general will be elected. All three of the candidates – Shirley Botchwey of Ghana, Joshua Setipa of Lesotho and Mamadou Tangara of Gambia – back reparatory justice.

Speaking to BBC Radio 4’s Today programme, Frederick Mitchell, the foreign minister of the Bahamas, said he believed the UK would change its stance, saying: “It may take a while for people to come around but come around they will.”

During the interview with the BBC, Sir Keir was also asked about a complaint Donald Trump’s team has filed against the Labour Party objecting to its staff and activists volunteering for Kamala Harris’s presidential campaign.

“I think this needs to be seen for what it is,” the prime minister said, adding: “It is some Labour Party members and staff in their free time campaigning.

“It’s happened in every election in different parts of the world. All political parties do it… I think it needs to be put in it’s proper perspective.”

Sir Keir added that both he and Trump wanted to have a “good working relationship” and that the pair recently had dinner together.

He dismissed suggestions that his party were still adjusting to being in government, saying he had “absolute clarity” on his “number one mission” of economic growth.

Next Wednesday Chancellor Rachel Reeves, will set out the government’s tax and spending plans in the Budget.

Ahead of this Reeves told the BBC she would be changing the government’s self-imposed debt rules to free up money for infrastructure spending.

Asked about the Budget, Sir Keir said the economy barely grew under the Conservatives and that he wanted to “clear the decks” and “clear up the mess”.

“I believe in running towards problems. If you know what the problem is, what the challenge is, every business knows this, every family knows it, run towards it and fix it.”

The Conservatives have challenged Labour’s argument that they created a £22bn black hole in the economy and questioned the chancellor’s decision to change the debt rules.

The party’s shadow Treasury minister Gareth Davies said “uncertainty over additional borrowing risks interest rates staying higher and for longer.

“It’s families up and down the country who would pay the price.”