(2) Any reduction required by virtue of this paragraph to be made in the compensation payable in respect of the compulsory acquisition of an interest in land shall be effected as follows: that is to say, the War Damage Commission shall pay to the Minister or authority by whom that interest is compulsorily acquired a sum equal to the amount of the reduction, together with interest thereon at the rate of two and a half per cent. per annum from the date of the acquisition, and shall deduct that amount (including interest thereon as aforesaid) from the amount of any value payment or share of the value payment (including interest on any such payment or share) payable by the Commission under the War Damage Act, 1943, to the person from whom that interest is acquired