The details and provocative title of Prince Harry’s memoir – with its ‘raw unflinching honesty’ – have been revealed.

Entitled SPARE, the Duke of Sussex’s story is expected to be released on 10 January.

SPARE appears to be a reference to the phrase ‘heir and a spare’ – suggesting his attitude to his place in the Royal Family.

Details of Princess Diana’s funeral are mentioned in the book, and the publishers say: “SPARE takes readers immediately back to one of the most searing images of the twentieth century: two young boys, two princes, walking behind their mother’s coffin as the world watched in sorrow-and horror.

“As Diana, Princess of Wales, was laid to rest, billions wondered what the princes must be thinking and feeling and how their lives would play out from that point on.”

Billed as “his story at last”, the book also delves into Prince Harry’s “personal journey from trauma to healing”.

“With its raw, unflinching honesty, SPARE is a landmark publication full of insight, revelation, self-examination, and hard-won wisdom about the eternal power of love over grief,” a description of the book reads.

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Prince Harry is hoping to support charities, including Sentebale and WellChild, with donations from the proceeds of his book sales.

‘Candid and emotionally powerful story’

“Penguin Random House is honoured to be publishing Prince Harry’s candid and emotionally powerful story for readers everywhere,” said the publisher’s chief executive, Markus Dohle.

“He shares a remarkably moving personal journey from trauma to healing, one that speaks to the power of love and will inspire and encourage millions of people around the world.”

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The memoir will be available in English in the UK, Ireland, Australia, New Zealand, India, South Africa and Canada, and it will also be published in 15 other languages, including Spanish, Italian, German and Chinese.

Buckingham Palace has declined to comment on the book’s details.