Duke’s St. James in London is offering a new Mini Dukes and Duchesses Package with dress-up costumes, afternoon tea and kid friendly treats.   With the package, book any room or suite and get a second children’s room for free for children up to age 18!  Rates for two rooms start at £390 (approximately $634) per night with breakfast through January 13, 2013. That’s a 50% savings on standard hotel rates!  Your children can enjoy the option to dress up in pint-sized gowns, tiaras and Windsor-style uniforms for afternoon tea. Whatever the occasion, children are always treated like royalty at the hotel.  Kid-friendly amenities include a cuddly Dukesy dog toy for guests under age six and a bedtime storybook for older children. There are also kid-size slippers and Playstation games in room. The hotel is located in Mayfair close to Buckingham Palace, Hyde Park and the West End.