2. The repeal by Article 44(3) and Schedule 6 of the Clean Air Act (Northern Ireland) 1964 and Article 24(5) of the Building Regulations (Northern Ireland) Order 1979 [1979 NI 16] shall not affect any regulations such as are mentioned in paragraph 1 in force immediately before 1st October 1973 and continued by paragraph 2 of Schedule 2 to that Order of 1979 and paragraph 1.N.I.