§ "If within one month after the receipt of any such notice by any owners, or by any owners and lessees, requiring the Council to purchase their estate and interest in any lands in manner aforesaid, the Council shall elect to abandon the proposed charge to which such notice relates, the Council may give notice by registered letter addressed to such owners, or to such owners and lessees, of their intention to abandon the same, and thereupon the Council shall be relieved from any liability to purchase such lands or the estate or interest therein to which the notice relates, and the charge so far as relates to such lands, or any estate or interest therein of such owners or such owners and lessees, as the case may be, shall be extinguished, and the Council shall give a certificate under their common seal that such charge is extinguished, which shall be sufficient evidence thereof: Provided that the Council shall pay to the owners or to the owners and lessees, as the case may be, all costs, charges, and expenses reasonably and properly incurred by them in consequence of the said lands having been included in the assessment, such costs failing agreement, to be settled by a master of the High Court."