Any young man wishing to fill a glass slipper had better watch out. Sisters as ugly as these are rare. In fact they're only together for old time's sake. But they guarantee a jolly good dance for your money! They are ballet celebrities Sir Frederick Ashton and Robert Helpmann rehearsing for their roles in Cinderella, by London's Royal Ballet. They danced the parts together when the ballet was first produced exactly 17 years ago, at Christmas 1948.