Ask an Property Solicitor. Get an Answer ASAP.
I would like to add I am the brother in law of this person trying to help......As far as I am aware they all went to the council to ask permission and was granted it. whether there is any written proof or not I am not sure
I don't know if they were named on the agreement
My sister in Law did often stay at her boyfriends but in the same town 5 mins away Does that warrant living elsewhere?