THIS is what I'm referring to, Buenchico. Clearly the Government-based website doesn't cover enough of the basics in this case.
"Protected tenancies : If your tenancy is a private tenancy which began before 1 April 2007 you may be a protected tenant. Protected tenancies have their rents controlled by legislation. No new protected tenancies can be created but if you had a protected tenancy before 1 April 2007 your protection will continue as long as you occupy the property. Determining whether a tenancy is protected or not can be difficult as it depends on the letting history of the property. The key features of a protected tenancy are:
The property was built or converted for letting before 1956
The property was let as a private tenancy in 1978
The tenancy began before 1 April 2007
You can check online if a tenancy is listed on the rent register as protected. For more information, see www.nidirect.gov.uk. This is not an exhaustive list and a tenancy may be protected although it is not on the rent register."
Also, from the same source: -
Protected tenants: If you have a protected tenancy, as well as the basic rights of all private tenants, you also have the right:
to assign (pass on) the tenancy to a person who has the right of ‘succession’ to the tenancy. This is sometimes difficult to enforce so you should consult an experienced adviser, for example, at a Citizens Advice Bureau. To search for details of your nearest CAB, including those that can give advice by e-mail, click on nearest CAB.
to security of tenure. Your landlord can only repossess the accommodation in certain specified circumstances - see under heading The right to stay in the accommodation
to have the accommodation kept in a reasonable state of repair."
This is why the OP needs to visit the CAB who are well on top of this within Northern Ireland.