The King's role as head of the Commonwealth is about "inspiring and convening, rather than policy making", says Buckingham Palace - distancing him from rows over whether the UK should apologise and make reparations for its part in the Atlantic slave trade.

The Palace statement clarifying the King's non-political role in the Commonwealth comes as the organisation's leaders gather for a summit in Antigua and Barbuda.

The King is to deliver a speech on Tuesday which is expected to recognise the painful legacy of slavery. But his speech will reflect the position of the UK government.

UK Prime Minister Andy Burnham had suggested there could be some form of apology over slavery, but has ruled out financial reparations.

The British government has never formally apologised for slavery or offered to pay reparations.

On Saturday, the prime minister said that the UK "must face up to the past" over the "brutal and barbaric violation" of the slave trade, and that he was "open" to the possibility of a formal apology.

But on Monday, his official spokesperson said that while Burnham had "expressed his sorrow and regret for the pain and suffering caused by the transatlantic slave trade", this was "distinct from a formal apology".

Burnham thought it was "right that a formal apology is discussed properly with the countries and communities most affected", his spokesperson said.

"An apology of this significance should be informed by the people and countries most affected," they added.

The King is on a tour of the Caribbean and touched down on Friday in Antigua and Barbuda, which is hosting the Commonwealth gathering, having visited the Bahamas and Guyana.