A landlord will deal with breaches of covenants by serving a Notice of breach of covenants (also known as a ‘section 146 notice’) on their tenant.
This notice warns the tenant that they are in breach of the terms of the lease. It sets out the landlord’s intention to forfeit the lease and gives the tenant time to fix the breach.
A section 146 notice cannot be used if the tenant has not paid the rent.
If the lease is a long residential lease Ask a lawyer for specific advice as your tenant may have additional rights.