2. In these Regulations “the principal Regulations” means the Social Security (Categorisation of Earners) Regulations (Northern Ireland) 1978(1), and a reference to a numbered Schedule is a reference to the Schedule to the principal Regulations bearing that number.
S.R. 1978 No. 401. The relevant amending Regulation is S.R. 1998 No. 250: see also S.R. 1999 No. 2 which continued the operation of the amendment made by S.R. 1998 No. 250.