categories of a reasonable man
professionals meet the standard of care of a reasonably competent expert in the same field (Bolam)
children - meet the standard of care of a reasonable child of the same age - (mullin v Richards)
leaners - meet the standard of care of a reasonable competent person with experience - (nettleship v Weston)
an ordinary man doing a test - meet standard of care of a reasonably competent person doing the task - (wells v Cooper)