(1) The contribution conditions for deserted wife's benefit are -
(a) that the husband had qualifying contributions in respect of not less than 156 contribution weeks in the period beginning with his entry into insurance and ending immediately before the relevant time, and
(b) that, if at the relevant time, 4 years or longer has elapsed since the husband's entry into insurance -
(i) the yearly average for the 3 contribution years, or (if warranted by his insurance record) 5 contribution years, ending with the end of the last complete contribution year before the relevant time is not less than 39, or
(ii) the yearly average in respect of the period commencing at the beginning of the contribution year in which his entry into insurance occurred and ending at the end of the last complete contribution year before the relevant time is not less than 48,
but, if the foregoing conditions are not satisfied on the husband's insurance record, they may be satisfied on the woman's insurance rec