Residential Tenancies Act 2004
Tenant may terminate where consent to assignment or sub-letting withheld.
186.—(1) This section has effect—
( a) despite the fact that the tenancy concerned is one for a fixed period, and
( b) despite anything to the contrary in the lease or tenancy agreement concerned.
(2) If a landlord of a dwelling refuses his or her consent to an assignment or sub-letting of the tenancy concerned by the tenant, the tenant may serve a notice of termination in respect of the tenancy and terminate it accordingly.
(3) The period of notice to be given by that notice of termination is—
( a) that specified in section 66 , or
( b) such lesser period of notice as may be agreed between the landlord and the tenant in accordance with section 69 ,
even if the lease or tenancy agreement provides for a greater period of notice to be given.