LONDON, England - Some cars are fit for a king but this one, a 1994 Audi quattro convertible, was deemed fit only for a princess.The car, used once-upon-a-time until she lost her Prince Charming, was used by Diana, Princess of Wales, and is now on show in a hotel in central London near St Paul’s Cathedral. She and Prince Charles divorced in 1986.The nearly 20-year-old car is to be auctioned at Blenheim Palace on June 29, 2013. The auctioneer is hoping it will make the equivalent of R300 000 - not a heck of a lot less than a new Audi A3 convertible in 2013.AMERICAN INQUIRIESThe Audi, once the “family car” used by Diana, was photographed several times while she was driving princes William and Harry to school.Auctioneer Chris Routledge said: “This is an extraordinary opportunity to own a piece of royal history. We’ve put a guide price on the car of £20 000 to £25 000 (around R300 000) but have no idea what it will go for.“We have, however, had enquiries from around the world, particularly from America.”The car is said to be in immaculate condition and has covered only 32 000km. Hotel visitors can leave a sealed bid for the car.If you happen to be in London, the car will be on display until early June at the George St. Paul’s Hotel.The seller was not named.