From the comments in the second Telegraph article you posted;
" Pat Meave Hopkins 2 months ago
As a nurse who practiced in the US for over a quarter of a century I am both saddened and provoked when I read these statistics. In the US in 1999 the Institute of Medicine released a report that stated 98,000 people lost their lives to preventable causes in US hospitals yearly. What ensued was a plethora of research and patient safety initiatives to counter this tragedy. The research evidence that pointed to the correlation of safe nurse staffing and care was undeniable. Yet as a nurse who practiced at the bedside I witnessed continued short staffing of nurses, unsafe working conditions that required nurses to work excessive shift lengths, no proper breaks for food or hydration, nurses being forced to work in areas that they were not properly oriented, competent, or qualified to work in. In Sept of 2013 in The Journal of Patient Safety an article entitled "A New, Evidence-based Estimate of Patient Harms Associated with Hospital Care" by John T. James PhD wherein the estimated preventable deaths is reported in excess of 400,000 a year. That my UK friends is 1000 preventable deaths a DAY."