The first images of the cast in A Princess Undone, now in previews at the Park Theatre, have been released. A Princess Undone is making its London debut at the Park Theatre, directed by Jonny Kelly and the first images from the production have now been released ahead of the production’s opening night on the 26th February. Kensington Palace, 1993. She was the Diana of her day. That day has gone, but HRH The Princess Margaret seeks one final chance to be of service.