In the documentary, a close friend of Princess Margaret has revealed how the Queen thanked her for introducing her late sister to the Roddy Llewellyn, the man she had an affair with.
Lady Anne Glenconner reveals how she was approached by the Queen after Princess Margaret's funeral in 2002, and that the royal thanked her for introducing her sister to Llewellyn because he made her 'really happy.'
Speaking in the documentary, Lady Glenconner says: 'After Princess Margaret’s funeral, the Queen, she said, 'I’d just like to say Anne, it was rather difficult at moments, but I thank you so much introducing Princess Margaret to Roddy 'cause he made her really happy'.'
Margaret and Llewellyn famously hit global headlines in 1976 after they were photographed holidaying on the island of Mustique together - Margaret's marriage to Lord Snowdon ended just a month later.
Margaret and Llewellyn enjoyed a passionate five-year affair during the 70s.
Llewellyn was 25 when he began dating the Princess, who was then 43 with two children.
Princess Margaret was married to Antony Armstrong-Hones, the Early of Snowden in 1960 and the couple divorced in 1978.
Lady Glenconner says, 'It was difficult for the Queen and I felt rather guilty always having introduced Roddy to Princess Margaret.'