contribution quarterhas the meaning given in regulation 54(8)(b) of these regulations;
late notification periodmeans the period from the date a person liable to pay a Class 2 contribution was first required to notify the Secretary of State in accordance with the provisions of regulation 53A of these regulations (notification of commencement or cessation of payment of Class 2 or Class 3 contributions) to the date of the last day of the contribution quarter immediately before the contribution quarter in which he gives that notification;
relevant daymeans the first day in respect of which a person would have been entitled to receive the contributory benefit in question if any contribution condition relevant to that benefit had already been satisfied.”
the principal Regulationsmeans the Social Security (Contributions) Regulations 1979.