VATLP04330 | Taxable person: managing agents for property: properties where the option to tax has been exercised
From HM Revenue & Customs · VAT Land and Property
The supply to the tenant is by the landlord. If, in the case of an opted property, there are unpaid sums owing from a tenant, bad debt relief is only allowable to the landlord and not the agent (because the supply by the agent is to the landlord, not the tenant).
A failure to standard rate the recovery of the landlord’s insurance from the tenants is still a fairly common error in respect of opted properties (but note that in exceptional cases the tenant may be the policy holder).