The 68-year-old Prince famously had a lot of flings and dates over the years but one that has largely avoided the story books and news columns was his rumoured relationship with Diana’s sister, Sarah Spencer.

Years before the Prince started his courtship of Diana, he had a brief stint with the late Princess’ sister. Not much is known about the Prince’s short relationship with Sarah (now Lady Sarah McCorquodale) but rumour says the Prince called it off after 22-year-old Sarah spilled the gossip about the relationship (and many of her other relationships, her previous alcoholism and her anorexia) to two reporters.

One of the reporters, James Whittaker, wrote in the Mirror that Sarah had said to him she would not marry Charles ‘if he were the dustman or the King of England’.

The relationship introduced Charles to Diana, whom he married three years later. Diana’s biographer, Andrew Morton, has said despite Charles and Sarah’s short relationship, Sarah was always one of the few people Diana trusted.