28U.K.For the purposes of this Schedule—
(a)a company is a “group company”, in relation to another company, if they are members of the same group,
(b)two companies are members of the same group if, and only if, one is a 51% subsidiary of the other or both are 51% subsidiaries of a third company, and
(c)a company is a “parent company” in relation to another company if that other is its 51% subsidiary.