Sarah Ferguson has sparked further rumours about the state of her debt management, after receiving a £17,000 bill from another one of her creditors.

The Duchess of York also received another threat of legal action after receiving the unpaid bill for more than £17,000 from Richard Owen, a PR consultant, for work to help the Duchess improve her image.

The demand also stated that if Ms Ferguson was unable to settle the amount within 21 days, then Mr Owen would be able to apply for the bankruptcy of the Duchess.

This is the fourth demand that the former wife of Prince Andrew has received in the last year, and fuels further speculation that she may be suffering with serious debt problems after her New York offices were closed with debts of over £600,000.

Ivan Cooper, Chairman at debt advice specialists Chiltern, said: “This news that another bill remains unpaid raises further concern for the extent of the duchess’ debt problems.

“I’d recommend she follows the advice the Queen is alledged to have told her, in that she needs to stop spending and seek some debt advice.”

The three companies who are believed to have issued writs against the duchess when she allegedly failed to settle their repeated demands for money included a bill of over £18,000 from a Hertfordshire- based accountancy firm.

It is understood that these have now been repaid.

Fergie’s recent debt management revives memories from the 1990′s when at one point her spending had resulted in a debt to Coutts bank for almost £5 million. Since then, the Duchess has tried to reduce her lavish lifestyle and become self-sufficient, by reinventing herself as children’s author, after-dinner speaker and the face for diet company Weight Watchers.