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As regards ***** ***** question concerning the concierge, you do need to read the Lease under which your Landlord holds the property. This will explain what services are provided by the Freeholder, to include the concierge service.
If the Lease states that the payment of the service charge includes a full concierge service, including the collection and delivery of parcels, then that is what you are entitled to, and you are not under any duty to sign the indemnity. Likewise, if the Freeholder, via the concierge service, refuses to comply with its obligations under the Lease (ie by not delivering the parcels to you without the need for signing an indemnity), then the Freeholder is in breach of the terms of the Lease.
As you are not the Tenant under the Lease, you have no "contract" with the Freeholder, and you would need your Landlord to raise this with the Freeholder.
If the Lease does not include the collection and delivery of parcels to each resident under the list of sevices the Freeholder will provide to the residents, then the concierge company are entitled to ask you to sign the indemnity, as they are only under a duty to carry out the services as listed in the Lease.