Medical Law: FHS-style practice paper

"Montgomery v Lanarkshire [2015] has transformed the doctor-patient relationship from medical paternalism to patient autonomy, but at the cost of encouraging defensive medicine." Critically evaluate.

Mr Roberts, aged 82, is admitted to hospital with pneumonia. He has early-stage dementia but can communicate his wishes. His family insists on aggressive treatment including ventilation. Mr Roberts tells the nurse he does not want to be "hooked up to machines" and wants to "go peacefully." The consultant is unsure how to proceed. Advise on the legal framework.