Before section 15 insert:
14B—Abolition of certain common law defences
(1) The following common law defences are abolished:
(a) provocation;
(b) necessity;
(c) duress;
(d) marital coercion.
(2) To avoid doubt, the common law defences abolished by subsection (1)
remain available in respect of offences allegedly committed before the commencement of that subsection.