Exemption from liability to pay contribution in certain circumstances

(1) An employed person and his employer shall be exempt from liability to pay contribution for any contribution week 22 Social Security (a) in which no work is done by the employed person and in respect of which he receives no earnings; or (b) in respect of which the employed person is entitled to a credited contribution under the Benefit Regulations. (2) Nothing in paragraph (1) shall be deemed to affect the liability of an employed person and his employer to pay a contribution for any contribution week in which the employed person is on leave if a contribution is normally payable with respect to the employment of such person.