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Hi, thank you for your enquiry and your patience. It is not as straight forward as that. If you stop paying rent you are in breach of your own tenancy. The fact that they did not have the requisite permission makes the subletting unlawful.
However, even if the subletting is unlawful your tenancy is not affected. Your tenancy is valid because your landlord, who is the head tenant's tenant, created a tenancy - your subtenancy. This created the relationship of landlord and tenant between you and them even though they had no authority to let the house.
You therefore lawfully occupy the property under the subtenancy and are obliged to pay the rent until either your landlord decides to end your tenancy in the proper way, or your landlord's own tenancy comes to an end.
You therefore should continue to pay your rent and should the head landlord decide to allow you to carry on living in the property all that will change will be that you will start paying the head landlord directly. Your landlord cannot just expect you to leave, they would have to evict you lawfully should they want to terminate the subtenancy. I hope this is useful and I would be grateful for your rating at your earliest convenience. All the best
No problem at all. If it is not too much trouble I would be grateful for your rating by clicking on the row of stars at the top for ja to acknowledge your feedback. All the best