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The Charity Commission has confirmed it has contacted trustees of The Prince Andrew Charitable Trust over "a number of regulatory issues", including the late filing of its yearly return. The Duke of York's charity has been flagged with a red warning notice on the commission's website as its accounts are 51 days overdue. It was meant to have filed them by the end of January after being served with at least two reminder notices.

News of the missed deadline and other issues about its operations has sparked further concerns about the charity's future.

Several major backers have already cut their ties with following Andrew's "car crash" interview with Newsnight's Emily Maitlis in November, when he was questioned about his friendship with the late US sex offender Jeffrey Epstein. The Duke, 60, has always denied any wrongdoing.

Last year his trust, which is understood to employ 19 people, declared an income of around £1.4million, with money going to help young people in business, education and sport.

Legal responsibility to file its accounts lies with its trustees, who do not include Andrew. But he is its public face after founding it in 1984.