"1. Meaning of "disability" and disabled person" (1) Subject to the provisions of Schedule 1, a person has a disability for the purposes of this Act if he has a physical or mental impairment which has a substantial and long-term adverse effect on his ability to carry out normal day-to-day activities. (2) In this Act "disabled person" means a person who has a disability."
" Long-term effects 2. (1) The effect of an impairment is a long-term effect if - (a) it has lasted at least 12 months; (b) the period for which it lasts is likely to be at least 12 months; or (c) it is likely to last for the rest of the life of the person affected. (2) Where an impairment ceases to have a substantial adverse effect on a person's ability to carry out normal day-to-day activities, it is to be treated as continuing to have that effect if that effect is likely to recur. … Normal day-to-day activities 4. (1) An impairment is to be taken to affect the ability of the person concerned to carry out normal day-to-day activities only if it affects one of the following- (a) mobility; (b) manual dexterity; (c) physical co-ordination; (d) continence; (e) ability to lift, carry or otherwise move everyday objects; (f) speech, hearing or eyesight; (g) memory or ability to concentrate, learn or understand; or (h) perception of the risk of physical danger. … Effect of medical treatment 6. (1) An impairment which would be likely to have a substantial adverse effect on the ability of the person concerned to carry out normal day-to-day activities, but for the fact that measures are being taken to treat or correct it, is to be treated as having that effect. (2) In sub-paragraph (1) "measures" includes, in particular, medical treatment and the use of a prosthesis or other aid. … Progressive conditions 8. (1) Where - (a) a person has a progressive condition (such as cancer, multiple sclerosis or muscular dystrophy or infection by the human immunodeficiency virus), (b) as a result of that condition, he has an impairment which has (or had) an effect on his ability to carry out normal day-to-day activities, but (c) that effect is not (or was not) a substantial adverse effect, he shall be taken to have an impairment which has such a substantial adverse effect if the condition is likely to result in his having such an impairment."
"8 The purpose of para. 8 is to protect an employee with a progressive condition to the extent specified in the paragraph. Parliament had to consider the moment at which such protection was to be given. The moment of diagnosis of the progressive condition was not chosen. The paragraph provides that, from the moment the conditions (a) and (b) in the paragraph are satisfied, no sooner and no later, the employee has the statutory protection afforded to disabled persons."
"16 I would keep in mind the purpose of the current statute in construing the words 'as a result of that condition' in this case. In deciding the extent of the protection to be given to disabled people, Parliament had to make a series of policy decisions, and those are reflected in the provisions of Schedule 1, which explain and elaborate upon the general definition in s.1. In my judgment, the court's task is to construe the words 'as a result of that condition' in para. 8(1)(b). The remaining provisions of the paragraph may throw light on that question, but in the end it is that expression which has to be construed. I bear in mind that the primary purpose of the paragraph is, as Mr McDermott submits, the protection of disabled people who have progressive conditions from the moment when symptoms first appear." and to the same effect Scott Baker LJ agreeing with Pill LJ said this at paragraph 22: "22 The purpose of para. 8 of Schedule 1 to the 1995 Act is to bring within the ambit of the protection of the Act those who have a progressive condition which would not otherwise be covered by s.1. This is important because an employer might be tempted to discriminate against an employee who, although not presently disabled to the point of the disability affecting his ability to do his job, was likely to become so in the future. Symptomless conditions do not fall within the Act. The trigger is that the individual has an impairment which has (or had) an effect on his ability to carry out normal day-to-day activities and which is likely to get worse, to the point where it has a substantially adverse effect."
"14 …Mr McDermott poses the question: what category of persons does Parliament intend to protect? It is those persons with progressive disease."
"19 In reaching that conclusion I have borne in mind Mr McDermott's submission that the closing words of the paragraph are not triggered by the circumstances. In my judgment, nothing in the wording of the paragraph justifies its construction in any other way than that of following systematically through its provisions and reaching a result. I see no justification for excluding the operation of the closing words of the paragraph because the condition or impairment in subparagraph (b) is of a different kind and with different symptoms from the condition and impairment contemplated in the closing words. The condition (cancer) is likely to result in an impairment having a substantial adverse effect within the meaning of those words. Nor do I see merit in the similar argument that the closing words could not cover the present situation because of the difference between the current impairment and the symptoms which are likely in the future. In my judgment, nothing in the wording of the paragraph excuses the court from the crucial task of construing the words 'as a result of that condition' in the medical and factual context present."
"21 In our judgment the words of the paragraph are clear. The question to be asked is whether, on the balance of probabilities, the claimant has established that the condition in his case is likely to have a substantial adverse effect. It is not enough simply to establish that he has a progressive condition and that it has or has had an effect on his ability to carry out normal day-to-day activities. The claimant must go on and show that it is more likely than not that at some stage in the future he will have an impairment which will have a substantial adverse effect on his ability to carry out normal day-to-day activities. How the claimant does this is up to him. In some cases it may be possible to produce medical evidence of his likely prognosis. In other cases it may be possible to discharge the onus of proof by statistical evidence."