She revels in the nickname 'The Dotty Duchess', has a collection of stuffed animals and is a 'great admirer' of King Charles . Jane Percy, the indomitable Duchess of Northumberland , was the star of a fly-on-the-wall TV series which has been seen by millions. She worked alongside King Charles, when he was still Prince of Wales, over 15 years as Lord Lieutenant of Northumberland. She stepped down last year to focus on her latest venture, the biggest play structure in the world , the £17.5m '