(1) For the purposes of assessing the degree of occupational asthma impairment, the A.M.A Guides apply—
(a) subject to any regulations made for the purposes of this section; and
(b) as if for Chapter 5, Tables 8 and 10 of those Guides there were substituted the guidelines entitled "Impairment Assessment in Workers with Occupational Asthma" in force under section 67.
(2) In this section, occupational asthma has the meaning given by the guidelines referred to in subsection (1)(b).