11.—(1) Regulations 8, 10, 11 and 20 of the Collection and Enforcement Regulations continue to apply in relation to an arrears-only case, as they were in force immediately before the amendments made by regulation 4(3) to (6) come into force, until notice is given to the non-resident parent by the Secretary of State that the provisions of the Regulations as amended by regulation 4(3) to (6) apply to that case.
(2) Any notice given under paragraph (1) must be in writing and sent by post to the non-resident parent's last known or notified address and will be treated as having been given on the second day following the day on which it is posted.
(3) For the purposes of this regulation any reference to a non-resident parent includes reference to an absent parent.