Theories abound on disappearance of Lord Lucan

Lord Lucan’s disappearance after his family’s nanny was found bludgeoned to death more than four decades ago continues to baffle detectives and historians.

The seventh earl of Lucan disappeared after the body of Sandra Rivett, nanny to his three children, was found at the family home at 46 Lower Belgrave St in central London on November 7, 1974.

Here are some of the countless theories about what became of the aristocrat: