Princess Margaret had a sommelier's nose for sycophants and could reduce the powerful to a damp wreck...but she loved nothing better than dancing to reggae, writes SUSANNAH CONSTANTINE (who used to date her son!) dailymail.co.uk - get the latest breaking news, showbiz & celebrity photos, sport news & rumours, viral videos and top stories from dailymail.co.uk Daily Mail and Mail on Sunday newspapers.