(6) Where the aggregate of all contributions recei
ved by a registered referendum committee exceeds the aggregate of all referendum expenses and other expenses incurred by the
committee before the chief agent of the
committee files the referendum finances return with the Chief Electoral Officer, the
committee shall return the amount of the excess to the contributors in proportion to their contributions or, to the extent that a return is not possible, shall pay to Her
Majesty in right of Canada an amount ...[+++] equal to the amount of the excess that is not returnable.