(1)For the purposes of sections 735 and 737 to 743, a policy insures against a health risk if it insures against the insured becoming, or becoming in any specified way, subject—
(a)to any physical or mental illness, disability, infirmity or defect, or
(b)to any deterioration in a condition resulting from any such illness, disability, infirmity or defect.
(2)For the purposes of sections 735 and 737 to 743, a policy insures against an employment risk if it insures against circumstances arising as a result of which the insured ceases—
(a)to be employed or hold office, or
(b)to carry on any trade, profession or vocation.
(3)For the purposes of section 735, this section and sections 737 to 743, references to insurance against a risk include insurance providing for benefits payable otherwise than by way of indemnity if the circumstances insured against occur.