8.—(1) The assets of any business owned in whole or in part by the relevant person and for the purposes of which he is engaged as a self-employed earner, or if he has ceased to be so engaged, for such period as may be reasonable in the circumstances to allow for disposal of any such asset.
(2) The assets of any business owned in whole or in part by the relevant person where—
(a)he is not engaged as a self-employed earner in that business by reason of some disease or bodily or mental disablement; but
(b)he intends to become engaged or, as the case may be, re-engaged as a self-employed earner in that business as soon as he recovers or is able to become engaged or re-engaged in that business.