Sarah Ferguson’s alleged spending habits have been revealed (Image: Rob Kim/Getty Images for Global Citizen)

The former Duchess of York’s alleged expensive spending habits have been revealed in a new book by royal author Andrew Lownie, titled ‘Entitled: The Rise and Fall of the House of York’.

In an excerpt of the book, the royal author explains how Sarah Ferguson’s former partner, John Bryan, detailed information to News of the World, about his relationship with the former Duchess of York.

Lownie writes: “He [Bryan] revealed her £860,000 annual expenditure, including £300,000 on staff, £150,000 on gifts, £50,000 on flowers, £50,000 on parties and £150,000 on travel; how she spent £100,000 on clothes and £25,000 in a single hour at Bloomingdale’s; and how her father had been caught by his second wife entertaining two women in a room at Claridge’s a week before Sarah’s engagement, in what he described as ‘a business meeting’.”

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The biography, ‘Entitled: The Rise and Fall of the Yorks’, gives a startling insight into the Duke and Duchess’ “hedonistic life, controversial friendships and secretive money-making endeavours”.

Said to be based on four years of research and hundreds of interviews, Lownie claims Ferguson’s life as a member of the Royal Family was notable for being “marked by ambition and financial recklessness”.

Elsewhere in the book, Lownie claims Sarah Ferguson became well known for running up huge bills on credit in stores.

Lownie writes: “She also found ‘ways and means of getting around her financial restrictions’. For example, Mohamed Al-Fayed, owner of Harrods, never pressed her to settle her account at the store, a practice she exploited elsewhere. A former employee confided: ‘These accounts just never get paid, somehow. The shops don’t complain because of who she is, or they never used to.’”

Sarah Ferguson’s alleged spending habits have been revealed (Image: Max Mumby/Indigo/Getty Images)

Further allegations of more wild spending include £14,000 in just one month with a London wine merchant, as well as luxury holidays to “Puerto Rico, Bermuda, Switzerland, Hong Kong and Poland and four trips to America”, each time reportedly staying at the luxury Carlyle Hotel, where the cheapest suite was £330 a night.

Lownie also details further extravagant spending, including visits to New York, where she allegedly took one car to the airport “and another for her ten suitcases”.

A spokesperson for the Duchess of York was contacted for comment.