Regulation 11 of the Social Security (General Benefit) Regulations 1982 (further definition of the principles of assessment of disablement and prescribed degrees of disablement) shall be amended as follows—
(a) at the beginning of paragraphs (3), (4) and (5) there shall be inserted the words “Subject to paragraphs (5A) and (5B)”; and
(b) after paragraph (5) there shall be inserted the following paragraphs—
(5A) Where—
(a) a person has an award of industrial injuries disablement benefit in respect of the disease specified in paragraph D1 of Part I of Schedule 1 to the Social Security (Industrial Injuries) (Prescribed Diseases) Regulations 1985 (in this paragraph and in paragraph (5B) referred to as “disease D1”); and
(b) by virtue of either paragraph (3) or (4) that award takes account of disablement resulting from the effects of chronic bronchitis or emphysema, not being chronic bronchitis or emphysema prescribed in paragraph D12 of Part I of Schedule 1 to the Social Security (Industrial Injuries) (Prescribed Diseases) Regulations 1985 (in this paragraph and paragraph (5B) referred to as “disease D12”); and
(c) after the date on which the award referred to in sub-paragraph (a) of this paragraph was made the person becomes entitled to industrial injuries disablement benefit in respect of disease D12,
then, during any period when such disablement benefit is payable in respect of disease D12, paragraphs (3), (4) and (5) shall not apply to the assessment in respect of disease D1 for the purpose of assessing the extent of disablement resulting from disease D12.
(5B) Where—
(a) a person has an award of industrial injuries disablement benefit in respect of the disease D12; and
(b) by virtue of either paragraph (3) or (4) that award takes account of disablement resulting from the effects of pneumoconiosis, not being disease D1; and
(c) after the date on which the award referred to in sub-paragraph (a) of this paragraph was made the person becomes entitled to industrial injuries disablement benefit in respect of disease D1,
then, during any period when such disablement benefit is payable in respect of disease D1, paragraphs (3), (4) and (5) shall not apply to the assessment in respect of disease D12 for the purpose of assessing the extent of disablement resulting from disease D1.