In this Part -

"advance healthcare directive" - (a) in relation to a person who has capacity, means an advance expression made by the person, in accordance with section 84, of his or her will and preferences concerning treatment decisions that may arise in respect of him or her if he or she subsequently lacks capacity, and (b) in relation to a designated healthcare representative, means the advance expression referred to in paragraph (a) under which the representative was designated as such representative, which has not been revoked pursuant to section 84(7);

"applicable", in relation to an advance healthcare directive, shall be construed in accordance with section 85;

"designated healthcare representative", in relation to a directive-maker, means the named individual designated, pursuant to section 87, by the directive-maker, in his or her advance healthcare directive, to exercise the relevant powers;