Prince Harry’s memoir "Spare" has become the UK’s fastest-selling nonfiction book.

According to UK media, it recorded sales of 400,000 on its first day on sale, including hardbacks, ebooks and audiobooks. The book went on sale on Tuesday (January 10).

File footage shows Prince Harry and Meghan Markle being greeted by crowds outside a radio station in south London in January 2018. The couple were visiting Reprezent 107.3FM radio station in Brixton.

The couple subsequently relocated to California and stepped down from royal duties.

London, England, UK. 9th January 2018. Prince Harry and Meghan Markle visit Reprezent 107.3FM Radio station.

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Crowds greet Prince Harry and Meghan Markle outside London radio station

Prince Harry and fiancé Meghan Markle are greeted by crowds as they came to visit Reprezent 107.3FM radio station in Brixton, South London.

They came to visit this underground 24 hour radio station to learn about its work supporting young people.

The royal couple made an impromptu walkabout outside the radio station’s studios to meet well-wishers who had gathered in the cold to see them on Thursday (January 9).

One onlooker can be heard saying: "Oh my God! Oh my God! They are so cute!" as they watch the prince and his future bride meeting the Londoners.

The Duke and Duchess of Sussex are expecting their second child, a spokesperson for the couple has confirmed according to multiple reports.

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The Duke and Duchess of Sussex are expecting their second child, a spokesperson for the couple has confirmed according to multiple reports.

File footage shows Prince Harry and Meghan being greeted by crowds outside a radio station in south London in January 2018. The couple were visiting Reprezent 107.3FM radio station in Brixton.

The couple have since withdrawn from royal duties.