5(1)The provisions of this paragraph shall have effect in substitution for the provisions of section 90 of the Act of 1845.S
(2)No person shall be required to sell a part only—
(a)of any house, building or manufactory, or
(b)of a park or garden belonging to a house,
if he is willing and able to sell the whole of the house, building, manufactory, park or garden, unless the arbiter determines that—
(i)in the case of a house, building or manufactory, the part proposed to be acquired can be taken without material detriment to the house, building or manufactory, or
(ii)in the case of a park or garden, the part proposed to be acquired can be taken without seriously affecting the amenity or convenience of the house,
and, if he so determines, he shall award compensation in respect of any loss due to the severance of the part proposed to be acquired, in addition to its value: and thereupon the party interested shall be required to sell to the acquiring authority that part of the house, building, manufactory, park or garden.