“The Mental Capacity Act 2005 contains detailed provision for advance decisions – otherwise known as advance directives: see ss 24, 25 and 26. These are statements made by a person when capacitous, which may apply when the person loses capacity. If they are ‘valid and applicable’ they have the same effect as if made by that person capacitously. A competent patient has the right to refuse even life-sustaining treatment.”
Halsbury’s Law Exchange, 9th May 2012
Source: www.halsburyslawexchange.co.uk