Princess Diana's 'Panorama' interview was the most watched factual programme of the past 80 years.
Princess Diana
The late royal - who died in a Paris car crash in 1997 - famously spoke to Martin Bashir for the BBC One show in November 1995, and a staggering 22.8 million people tuned in.
During her interview, the princess spoke about her marriage to estranged husband Prince Charles, his affair with Camilla Parker Bowles - who is now the Duchess of Cornwall - and how she committed adultery with lover James Hewitt.
On Charles' relationship with Camilla, Diana famously said: "There were three of us in this marriage, so it was a bit crowded."
She also candidly spoke about her bulimia and trying to kill herself, her relationship with her two sons, Princes William and Harry, and how she didn't think Charles would make a great king.
And while she told Martin she could no longer be the queen of the country, she hoped she would become "queen of people's hearts".
The royal family had no idea the interview was taking place and were said to be furious. It was later claimed that Diana regretted taking part.
Soon after the interview, Queen Elizabeth gave permission for Diana and Charles to divorce.
While it is one of the most watched and memorable pieces of British television, the top spot went to comedy 'Only Fools and Horses'.
Just over 24 million people tuned in for the episode broadcast on December 29 1996, in which David Jason's Del Boy finally got rich after auctioning an antique watch.
According to the Press Association, it is the biggest audience ever recorded for a single transmission of a TV programme in the UK.