(b)the amount of expenditure incurred, directly or indirectly, by a company on an advertisement in any publication, being a publication in the nature of a souvenir, brochure, tract, pamphlet or the like, shall also be deemed,—(i)where such publication is by or on behalf of a political party, to be a contribution of such amount to such political party, and(ii)where such publication is not by or on behalf of, but for the advantage of a political party, to be a contribution for a political purpose.