Each of the following offences, that is to say—

1. a

   aiding, abetting, counselling, procuring or inciting the commission of an offence specified in Part I of this Schedule (hereafter in this paragraph referred to as a “substantive offence”);

2. b

   attempting or conspiring to commit a substantive offence;

3. c

   an offence under section 4 of the M1Criminal Law Act (Northern Ireland) 1967 of doing any act with intent to impede the arrest or prosecution of a person who has committed a substantive offence;

4. d

   an offence under section 5(1) of the Criminal Law Act (Northern Ireland) 1967 of failing to give information to a constable which is likely to secure, or to be of material assistance in securing, the apprehension, prosecution or conviction of a person for a substantive offence,

shall be treated for the purposes of this Act as if it were the substantive offence.