Fern Britton returns to Stoke Mandeville hospital to retrace the dramatic story of how the NHS saved her life. In 2016 whilst recovering at home from surgery, Fern was suddenly rushed into hospital and diagnosed with E coli and sepsis. She was immediately brought into emergency surgery that ultimately saved her life. She meets the surgeon who operated on her and the consultant who diagnosed her, to say thank you and find out more about the condition that nearly killed her. When Fern came in, her samples were sent to the pathology lab for analysis. Fern visits one of the NHS's busiest pathology labs, which processes 70,000 samples a day, to find out how it works and what has changed over the years. Fern also finds out how the NHS is fighting the war against superbugs though cleaning.