Hi
@Mona G , I am curious to know why you think that a fixed term lease gives you better protection?
Whether you (or they) sign a fixed or Part IV agreement makes no difference. You are fully protected already under Part IV which at the moment would give you ~6 month notice period. Maybe the agency have been a bit slow to realize that they are not obliged to offer and you are not obliged to sign recurring fixed term agreements. The Part IV agreement is probably just a formality to acknowledge this fact
If you are worried that they can kick you out easily, then you should know that they would still need to provide written notice with sufficient grounds to end your tenancy (
RTB). In that event, if you do not believe the grounds are genuine, you should request that they provide a sworn affidavit stating the grounds. This would give you a very strong position if anything was amiss.
Also, for peace of mind, I would call
Threshold as they will tell you exactly what you need to do.