Adrian Chiles

Since Jeremy Clarkson punched his Top Gear producer, Oisin Tymon, during a row over the lack of a hot meal, the problems of managing talent have been centre stage.

Former BBC Controller of Entertainment Commissioning Jane Lush said that the fracas distilled some of the key questions that executives and programme-makers face: “How power­ful is talent, where do you draw the line on bad behaviour and is top talent really irreplaceable?”

After winning hearts as a judge on BBC One's The Voice, Rita Ora has jumped ship to its competitor, X Factor. The ITV show has also poached famous BBC face – or rather voice – Nick Grimshaw, who hosts the prestigious Radio 1 Breakfast slot. While Grimmy will fulfill his judging duties alongside his BBC role, Ora's may come as a blow to BBC producers. But this isn't the first time stars have jumped ship. Here are a few of the most famous and most surprising moves.

1. Susanna Reid