473. Tenant released from covenants on assignment of tenancy.

Where a tenant1 assigns premises demised to him under a tenancy2 (whether or not the tenant is tenant of the whole of the premises comprised in the tenancy3):

(1)     if the tenant assigns the whole of the premises demised to him4, he is released from the tenant covenants5 of the tenancy and ceases to be entitled to the benefit of the landlord covenants6 of the tenancy, as from the assignment