Section 12(1): amended, on 1 April 1978, by section 20(1) of the Ministry of Energy Act 1977 (1977 No 33).
Section 12(2): amended, on 1 April 1978, by section 20(1) of the Ministry of Energy Act 1977 (1977 No 33).
Section 12(2)(b): amended, on 1 April 1978, by section 20(1) of the Ministry of Energy Act 1977 (1977 No 33).
Section 12(2)(c): amended, on 1 April 1978, by section 20(1) of the Ministry of Energy Act 1977 (1977 No 33).
Section 12(3): amended, on 1 April 1978, by section 20(1) of the Ministry of Energy Act 1977 (1977 No 33).
Section 12(4): amended, on 1 April 1978, by section 20(1) of the Ministry of Energy Act 1977 (1977 No 33).
Section 12(5): amended, on 1 April 1978, by section 20(1) of the Ministry of Energy Act 1977 (1977 No 33).
Section 12(5) proviso: amended, on 1 April 1978, by section 20(1) of the Ministry of Energy Act 1977 (1977 No 33).
Section 12(7): amended, on 1 April 1978, by section 20(1) of the Ministry of Energy Act 1977 (1977 No 33).