prescribed disease D12means the disease bearing that number and listed in Part I of Schedule 1 to the principal Regulations (chronic bronchitis and emphysema);
relevant claimmeans a claim for benefit in respect of prescribed disease D12;
relevant datemeans 13th September 1993 or the date upon which the claimant in question first satisfies the conditions specified in Schedule 1 to the principal Regulations in respect of prescribed disease D12, whichever is the later.
the principal Regulationsmeans the Social Security (Industrial Injuries) (Prescribed Diseases) Regulations 1985.