12.  If the Upper Tribunal determines that the acquisition of the right would have either of  the consequences described in paragraph 10, it must determine how much of the house,  building or factory the acquiring authority ought to be required to take.  13.  If the Upper Tribunal determines that the acquiring authority ought to be required to  take some or all of the house, building or factory, the compulsory purchase order and the  notice to treat are to have effect as if they included the owner’s interest in that land.  14. —(1) If the Upper Tribunal determines that the acquiring authority ought to be  required to take some or all of the house, building or factory, the acquiring authority may at  any time within the period of 6 weeks beginning with the day on which the Upper Tribunal  makes its determination withdraw the notice to treat in relation to that land.  (2) If the acquiring authority withdraws the notice to treat under this paragraph they must  pay the person on whom the notice was served compensation for any loss or expense  caused by the giving and withdrawal of the notice.  (3) Any dispute as to the compensation is to be determined by the Upper Tribunal.”  49