The Care Quality Commission is set to introduce radical changes to the way hospitals in England are inspected.
Following on from the review carried out by Sir Bruce Keogh, which found that 14 trusts had high mortality rates, the changes will be introduced by the end of the month.
As part of the changes the CQC introduced a new method to assess the level of risk of poor care at each trust, and four London NHS trusts are amongst the worst six in the country.
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"All it takes is for somebody to see me - and I could just die, just like that. I could want to go to the shop and not come home."
Before the killing, Peters searched the internet for "serial killers", "treatment of child killers in prison" and "premeditated murder".
Arriva Rail North, Greater Anglia and South Western Railway are all affected.