Legal 'gag' prevents NHS whistleblower revealing more
Mr Walker has urged MPs to help him expose further details, saying he could not say more "without incurring a much bigger risk of being sued by the NHS".
"I am still gagged. There's nearly 3,000 pages of evidence of which I have only been able to talk about a few. Those are the things I would like the health committee to expose," he said.
The BBC reported that Mr Walker had been threatened with legal action because of the interview.
More top news
Family of murdered soldier pays emotional tribute
The family of murdered soldier Lee Rigby paid tribute to him on Friday as detectives continued an investigation into his killing.
British WWII hero Jim Flint celebrates 100th birthday
As Jim Flint, one of WWII's most decorated airmen, celebrated his 100th birthday, ITV News looks back on his incredible life.
Emergency landing at Heathrow disrupts travellers
A BA jet was forced to make an emergency landing after one engine caught fire and the cowling of the other blew-off.