Regulations 10(1) and 11(1) do not require a landlord, or a superior landlord (as the case may be), to consent to the making of a relevant energy efficiency improvement specified in a tenant's request where, despite reasonable efforts by the landlord, or the superior landlord (as the case may be), any third party consent has been—
refused, or
granted subject to a condition with which the landlord, or the superior landlord (as the case may be), cannot reasonably comply.