Walsall Metropolitan Borough Council lists 18 conservation areas: Aldridge, Arboretum, Bloxwich High Street, Bloxwich Park, Bradford Street, Bridge Street, Caldmore Green, Church Hall, Darlaston, Elmore Green, Great Barr, Highgate, Lichfield Street, Old Pelsall, Old Rushall, Pelsall Common, Walsall Locks and Willenhall.
Walsall Council names materials in its own guidance. Its building conservation approach says repairs to protected buildings should use traditional materials including Welsh roofing slate, lime mortars and cast iron rainwater goods, as those suit historic buildings better than modern substitutes such as UPVC. That is the council's own sentence, and your lime plastering page can quote it with a link to the guidance.
We would explain how you check the conservation boundary, any Article 4 direction and the proposed work before confirming whether permission is needed. That answers it on the render page instead of on site.