For the purpose of section 87 -

(a) Subject to paragraphs (b) and (c), each disease or injury set out in column (1) of Part 1 of Schedule 4 is prescribed in relation to all insured persons who have been employed on or after 1 May 1967 in insurable (occupational injuries) employment in any occupation set against such disease or injury in column (2) of Schedule 4,

(b) Pneumoconiosis is prescribed -

(i) in relation to all insured persons who have been employed on or after 1 May 1967 in insurable (occupational injuries) employment in any occupation set out in Part 2(A) of Schedule 4; and

(ii) in relation to all other insured persons who have been employed on or after 1 May 1967 in insurable (occupational injuries) employment in an occupation set out in Part 2(B) of Schedule 4 and who have not worked at any time (whether in insurable (occupational injuries) employment or not) in any occupation in relation to which pneumoconiosis is prescribed by virtue of paragraph (i) of this sub-article, and

(c) Occupational deafness is prescribed in relation to all insured persons who have been employed -

(i) in insurable (occupational injuries) employment at any time on or after 1 May 1967, and