Negligence - damage caused by the breach
Factual causation must be proven using the ‘but for’ test (Barnett v Chelsea)
If there are multiple choices, causation cannot be proven (Wilsher v Essex AHA)
-> unless the D’s have all materially contributed to the risk (Fairchild v Glenhaven Funeral Services)
There must be a 50% or higher chance that the treatment by doctors has worsened the condition of a C for them to be liable (Hobson v East Berkshire AHA)
There must be no novus actus interveniens which breaks the chain of causation (Smith v Littlewoods)