If you were betting, it would be unwise to bet on anything less than 25 years.
"Ronald Ivor Ferguson" was the father of Sarah, Duchess of York, former wife to Prince Andrew, Duke of York/the Duke of York. He is the maternal grandfather of Princesses Princess Beatrice of York/Beatrice and Princess Eugenie of York/Eugenie of York. Major Ferguson was polo manager, initially to Prince Philip, Duke of Edinburgh/the Duke of Edinburgh and later, for many years, to Charles, Prince of Wales/the Prince of Wales.More Ronald Ferguson on Wikipedia.
Mr. Milton will vigorously contest the charges at trial and is confident that he will be exonerated.