Consent for Medical Treatment: What is 'Reasonable'?

The General Medical Council (GMC) instructs doctors to act 'reasonably' in obtaining consent from patients. However, the GMC does not explain what it means to be reasonable: it is left to doctors to figure out the substance of this instruction. The GMC relies on the Supreme Court's judgment in Montgomery v Lanarkshire Health Board; and it can be assumed that the judges' idea of reasonability is adopted.