ln this Act "lease" and "tenancy" have the same meaning; and both expressions include—
a sub-lease or sub-tenancy, and
an agreement for a lease or tenancy (or for a sub-lease or sub-tenancy).
The expressions "landlord" and "tenant", and references to letting, to the grant of a lease or to covenants or the terms of a lease shall be construed accordingly.
In this Act "long leas" means—
a lease granted for a term certain exceeding 21 years, whether or not it is (or may become) terminable before the end of that term by notice given by the tenant or by re-entry or forfeiture;
a lease for a term fixed by law under a grant with a covenant or obligation for perpetual renewal, other than a lease by sub-demise from one which is not a long lease; or
a lease granted in pursuance of Part V of the Housing Act 1985 (the right to buy) , including a lease granted in pursuance of that Part as it has effect by virtue of section 17 of the Housing Act 1996 (the right to acquire).