12.  If the Upper Tribunal determines that the acquisition of the right or the imposition of  the covenant would have either of the consequences described in paragraph 10, it must  determine how much of the house, building or factory the authority ought to be required to  take.  13.  If the Upper Tribunal determines that the 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 authority ought to be required to take  some or all of the house, building or factory, the authority may at any time within the  period of six 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.”.  70