Tenant Wants to Add a Partner to Their Tenancy

I'm sure this has been asked before, possibly by myself (!), but if a tenant wishes for their partner to move into the property after the initial 6-month term, who is liable to pay?

Would it be a brand new tenancy and, therefore, down to the landlord to pay for a new tenancy?

Or, as the tenant requested, would they be liable to pay?

Would it be classed as an amendment to an existing tenancy?

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