Where it is proved to the satisfaction of the county court on an application by the local authority or any person interested in a house that, owing to changes in the character of the neighbourhood in which such house is situate, the house cannot readily be let as a single tenement but could readily be let for occupation if converted into two or more tenements and that, by reason of the provisions of the lease or of any restrictive covenant affecting the house or otherwise, such conversion is prohibited or restricted, the court, after giving any person interested an opportunity of being heard, may vary the terms of the lease or other instrument imposing the prohibition or restriction so as to enable the house to be so converted subject to such conditions and upon such terms as the court many think, just.