As respects pneumoconiosis, regulations may further provide that, where a person is found to be suffering from pneumoconiosis accompanied by tuberculosis, the effects of the tuberculosis shall be treated for the purposes of this section and sections 108 and 109 above as if they were effects of the pneumoconiosis.

Subsection (1) above shall have effect as if after “tuberculosis" (in both places) there were inserted “ emphysema or chronic bronchitis ”, but only in relation to a person the extent of whose disablement resulting from pneumoconiosis, or from pneumoconiosis accompanied by tuberculosis, would (if his physical condition were otherwise normal) be assessed at not less than 50 per cent.

A person found to be suffering from pneumoconiosis shall be treated for the purposes of this Act as suffering from a loss of faculty such that the assessed extent of the resulting disablement amounts to not less than 1 per cent.

In respect of byssinosis, a person shall not (unless regulations otherwise provide) be entitled to disablement benefit unless he is found to be suffering, as the result of byssinosis, from loss of faculty which is likely to be permanent.