When the two Australian DJ's responsible for that now-infamous prank call picked up the phone, they would have had no idea how powerful their actions could be. 

The full extent of their influence on the suicide of Jacintha Saldanha - who was found dead three days after taking the call - is unknown, and is likely never to be ascertained, but the implications on their personal lives will be huge.

They will, however, not be subject to prosecution, The BBC reports. Scotland Yard said before Christmas that it had submitted a file to the Crown Prosecution Service on 19 December "for them to consider whether any potential offences may have been committed by making the hoax call".

The deputy police commissioner in Sydney, Nick Kaldas, has said he "did not expect there to be any requests," and, "There was some initial contact after the death of Jacintha Saldanha but not a lot since and because of the passage of time we believe it is unlikely any charges will be laid."

Saldanha, 46, was found hanged in her quarters three days after she transferred the call from Greig and Christian to a colleague at London's King Edward VII's hospital, who then described Kate's condition in detail.

The DJs from Australian station 2Day FM spoke of their grief on Australian television soon after the nurse's death. They said their prank led to "a tragic turn of events no-one could have predicted or expected".