923. Notice of proceedings for possession; in general.

The court1 may not entertain proceedings for possession of a dwelling house2 let3 on an assured tenancy4 unless:

(1)     the landlord5 (or in the case of joint landlords, at least one of them) has served on the tenant6 a proper notice7, and the proceedings are begun within the statutory time limits stated in the notice8; or

(2)     the court considers it just and equitable to dispense with the requirement of such a notice9.

The court must not make an order for possession on any of the statutory grounds10 unless that ground and the particulars of it are specified in the notice11. However,