Rhys Holleran, head of the Austereo network which owns radio station 2Day FM, has said he is "confident we haven't done anything illegal" in relation to the hoax call to the hospital at which Kate Middleton was treated. A nurse, Jacintha Saldanha, was found dead three days after taking the hoax call from the 2Day FM presenters.

Holleran said: "We are satisfied that the procedures we have in place have been met. Our main concern at this point in time is that what has happened is deeply tragic and we are incredibly saddened and incredibly affected by that... This is a tragic event that could not have reasonably been foreseen and we are deeply saddened by it. 

He added: "I think that prank calls as a craft in radio had been going on for decades. They are done worldwide and no one could have reasonably foreseen what happened."