In determining the percentage of a person's incapacity in relation to non - parliamentary employment, the Trust or a medical practitioner, as the case may be, must have regard to all relevant matters, including, but not limited to, the following:
(a) the vocational, trade and professional skills, qualifications and experience of the person;
(b) the kinds of non - parliamentary employment which a person with the skills, qualifications and experience referred to in paragraph (a) might reasonably undertake;
(c) the degree to which any physical or mental impairment of the person has diminished his or her capacity to undertake the kinds of non - parliamentary employment referred to in paragraph (b);
(d) the income (if any) derived by the person from personal exertion.