5. Section 57 of the Act shall not apply to an investment advertisement issued or caused to be issued by one body corporate in a group to another body corporate in the same group and for these purposes a group shall be treated as including any body corporate which is a related company within the meaning of paragraph 92 of Schedule 4 to the 1985 Act of any member of the group or would be such a related company if the member of the group were a company within the meaning of that Act.