Prince Charles had only met Lady Diana Spencer 12 times when he proposed. She was just 20 years old, more than a decade younger than her future husband, when she was invited to Windsor Castle for a visit that would change her life forever.
When she left, she was engaged to the future king and had officially begun her royal journey. As she arrived at the historical royal home, Charles told her he had "missed her so much", before the couple made their way to the nursery.
Speaking in a Channel 5 documentary Charles and Di: The Truth Behind Their wedding, royal expert Ingrid Seward explains that the big proposal was far from romantic.
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