80.—Subject to this Act, death benefit shall be payable as provided for in F629[sections 81, 83 and 84] where—

(a) an insured person dies as a result of personal injury caused on or after 1 May 1967 by accident arising out of and in the course of his or her employment, being insurable (occupational injuries) employment, or

(b) an insured person dies and where immediately before the date of death he or she was entitled to a disablement pension in respect of disablement assessed at 50 per cent or more.