The London hospital that treated Prince William's wife Kate has defended its response to the hoax call storm following reports the nurse duped by the prank left a suicide note criticising colleagues.

Jacintha Saldanha, 46, was found hanged a week ago, days after taking a call from two Australian radio presenters posing as Queen Elizabeth II and Prince Charles.

She had transferred the call to another nurse who revealed details of Kate's severe morning sickness.

King Edward VII Hospital says it offered support to Saldanha and had stressed to her that she would not be disciplined.

Advertisement

Australian police say death threats have been made against DJs Michael Christian and Mel Greig.

The presenters have been undergoing counselling and have not been seen in public since a TV interview on Monday.

- AAP