920. Recovery of possession; general principles.

The court1 may not make an order for possession of a dwelling house2 let3 on an assured tenancy4 except on one or more of the statutory grounds5 (some of which are mandatory and others discretionary in the sense that the court must be satisfied that it is reasonable to make a possession order). If the court is satisfied that any of the mandatory grounds6 is established, the court must7 make an order for possession8; and, if the court is satisfied that any of the discretionary grounds9 is established, the court may10 make an order for possession if it considers