Hi pingusolid
You will need to ask your landlord if the accommodation has been declared by the Local Authority to be Specified Accommodation for the purposed of Housing Benefit. It is not enough to be sheltered to automatically confer eligibility for Housing Benefit instead of Universal Credit.
If you have not been told by your landlord if your accomodation is Specified and you can claim Housing Benefit then it is important that you don't tick the box on your UC claim that you live in Sheltered Accomodation as this will automatically terminate UC Housing Costs.
Remember that some Sheltered Accomodation is covered by UC and the rules can be complex.
Let me know how you get on.
David
Nothing on this board constitutes legal advice - always consult a professional about specific problems