Prince Charles had only met Lady Diana Spencer a handful of times when he proposed, presenting her with a selection of rings by Garrard of Mayfair, the Crown Jeweller at the time - but things didn't get off to a good start with their engagement interview

When Prince Charles announced he was engaged to Lady Diana Spencer on February 24, 1981 - 40 years ago today - the world thought they were watching the beginning of a fairytale love story.