Do parent's have legal rights if a local authority's Occupational Therapy (OT) team is refusing to assess for a Disabled Facilities Grant (DFG), or if their assessment and report-gathering process appears inadequate or unauthentic?

We were. referred to Local Authority Lifelong OT services for a home assessment to look at ways to improve child's psychological and physical barriers to eating within her home environment which are profound and require specialist intervention from hospital specialists. Child has not had a home assessment to explore what adaptations could be made, just a referal for early support, NHS OT therapy block and a specialist chair and commode. What steps can I take to ensure Lifelong service conduct a lawful and adequate home assessment for a disabled facilities grant?