They may hold a lot of senior positions, but since their main ally sold his shares the Murdochs’ control of 21st Century Fox is only superficial.

Since the dark days of 2011, when he was considered damaged, the News Corporation mogul has managed to wrongfoot his critics, boost his wealth and position his sons as heirs apparent. 

The Sika saga goes on, as minority shareholders challenge the controlling family’s decision to sell out, and Rupert Murdoch reportedly hires a body double on a trip to Sydney.

Shareholders in Rupert Murdoch’s News Corp have rebelled over the company’s controversial dual-class share structure, but a study of these schemes suggests they should be careful what they wish for.