Regulation 2 Interpretation Original text. Later amendments are not shown. In these Regulations “the principal Regulations” means the Social Security (Contributions) Regulations 1979f1. Annotations Footnotes f1 S.I. 1979/591: the relevant amending instruments are S.I. 1983/10, 1996/3031, 1998/2211 and 1999/567. ← Regulation 1 Regulation 2 Regulation 3 →