380. Covenant against underletting.

A covenant against underletting is not broken by a letting of lodgings1 or other grant of a licence; but it is broken whenever the tenant parts with the exclusive possession of the premises or, if the covenant is so worded, any part of the premises to a subtenant2. If the covenant is against underletting simply, however, an underletting of part is no breach3. A covenant not to underlet is broken by an underletting from year to year4. To constitute a covenant against underletting, it is not necessary that words appropriate to underletting should be used; it is sufficient if