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bednobs: They are asking for MY details not those of the Tenant. I have already given them the Tenants details, including copy of Tenancy agreement , safety certs etc. The property is going onto the market, there is no 'new owner' yet. When an offer is accepted all the details of the Tenant will be there for the potential new owner to see. The Estate agency want proof of MY identity. Thankfully I've sorted it out now and believe its all above board. Thank you for your input.