2. For regulation 4 of the principal Regulations (presumption that a disease is due to the nature of employment) substitute—
4.—(1) Where a person has developed a disease which is prescribed in Part I of Schedule 1 in paragraphs A3(a), A4, A5, A6, A7, A8, A11, B1(a), B3, B4(a), B9, B10, B11, B12, B14, B15, C3, C24A, D4 or D7, that disease shall, unless the contrary is proved, be presumed to be due to the nature of that person’s employed earner’s employment if—
(a)that employment was in any occupation set against that disease in the second column of that Part; and
(b)the person was so employed on, or at any time within one month immediately preceding, the date on which, under these Regulations, that person is treated as having developed the disease.
(2) Where a person has developed a disease which is prescribed in Part I of Schedule 1 in paragraphs A1, A2, A3(b), A10, A13, A14, B2, B6, B8B, B13, C17, C18, C22(a), C24, C31, C32, D2, D3, D6, D8, D8A, D9, D10, D11, D12 or D13, that disease shall, unless the contrary is proved, be presumed to be due to the nature of that person’s employed earner’s employment if that employment was in any occupation set against that disease in the second column of that Part.
(3) Where a person in relation to whom tuberculosis is prescribed in paragraph B5 of Part I of Schedule 1 in respect of the occupation set out in sub-paragraph (a) in the second column of the entry relating to that disease, develops that disease, that disease shall, unless the contrary is proved, be presumed to be due to the nature of that person’s employed earner’s employment if the date on which, under these Regulations, that person is treated as having developed the disease is—
(a)not less than six weeks after the date on which that person was first employed in that occupation; and
(b)not more than two years after the date on which that person was last so employed in that occupation.
(4) Where a person has developed a disease which is prescribed in Part I of Schedule 1 in paragraphs B1(b), B4(b), B7 and B8A, that disease shall, unless the contrary is proved, be presumed to be due to the nature of that person’s employed earner’s employment if—
(a)that employment was in any occupation set against that disease in the second column of that Part; and
(b)that person was so employed—
(i)on the date on which, under these Regulations, that person is treated as having developed the disease; or
(ii)on a date at any time within—
(aa)in the case of B1(b) or B8A, two months;
(bb)in the case of B7, six months; or
(cc)in the case of B4(b), twelve months
immediately preceding the date on which, under these Regulations, that person is treated as having developed the disease.
(5) Where a person in relation to whom carpal tunnel syndrome is prescribed in paragraph A12 of Part I of Schedule 1 in respect of the occupation set out in sub-paragraph (b) in the second column of the entry relating to that disease, develops that disease, it shall, unless the contrary is proved, be presumed to be due to the nature of that person’s employed earner’s employment if that person was employed in that occupation on the date, or at any time within one month immediately preceding the date, on which under these Regulations that person is treated as having developed the disease.
(6) Where a person in relation to whom primary neoplasm of the epithelial lining of the urinary tract is prescribed in paragraph C23 of Part I of Schedule 1 in respect of the occupation set out in sub-paragraph (a), (b) or (e) in the second column of the entry relating to that disease, develops that disease, it shall, unless the contrary is proved, be presumed to be due to the nature of that person’s employed earner’s employment.
(7) Where a person in relation to whom pneumoconiosis is prescribed in regulation 2(b)(i) develops pneumoconiosis, the disease shall, unless the contrary is proved, be presumed to be due to the nature of that person’s employed earner’s employment if that person has been employed in either of the occupations set out in Part II of Schedule 1 for a period or periods amounting in aggregate to not less than 2 years in employment which either was employed earner’s employment or would have been employed earner’s employment if it had taken place on or after 5th July 1948.”.