Agreement or payment not to bar acquisition under fresh declaration,

Ifany land in respect of which the payment of a betterment fee has Deen accepted in pursuance of sub-section (3) of scction 81 or has been made after its determination under section 82 or section 85 or in respect of which an agreement regarding the bettesment fee has been executed under section 86, be subsequently required for any of the pur- poses of this Act, the payment or agreement shall not he deemed to prevent the acquisition of the land in pursuance of a fresh declaration published under section 6 of the Land Acquisition Act (Travancore Act