The clause "... sublet" is to protect landlord and at the same time forewarn the tenant does not use your property as an earning channel.
The more comprehensive the tenancy agreement would have consider from more angles to ensure it is fair for both parties.
(1) The occupier name & ID should been recorded under the TA. To ensure there are no illegal immigrant staying without landlord consent. Landlord has to be aware who is staying, and when is their permit/EP & passport expiring.
(2) Changes of occupier can be done with landlord consent, but name & ID should be recorded under a revised TA.
(3) Last to note is, landlord is the one responsible for illegal immigrant staying in his/her property. Thus facing penalty from authority.
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