“company” has the meaning given by section 170(9); and

references to a group, or to membership of a group, shall be construed in accordance with the provisions of section 170 read as if “51 per cent" were substituted for “75 per cent".

in relation to a group, means the company described in section 170 as the principal company of the group;

in relation to a subgroup, means a company that would be the holding company of a group but for being a 51% subsidiary of another company.

an option to acquire or dispose of shares or an interest in shares in that company, or

an option to acquire or dispose of any security within paragraph (b) or an interest in any such security, or

an interest in, or option over, any such option or security as is mentioned in paragraph (a), (b) or (c), or

any interest in, or option over, any such interest or option as is mentioned in paragraph (d) or this paragraph.

of any rights attached to the security other than rights relating, directly or indirectly, to shares of the company in question, or

of rights as regards which, at the time the security came into existence, there was no more than a negligible likelihood that they would in due course be exercised to a significant extent.