Non-metallic ceiling tiles having sound insulation properties; non-metallic facing tiles for use in buildings; non-metallic tiles; non-metallic tiles for ceiling cladding; non-metallic wall covering tiles; tiles, not of metal; tiles, not of metal, for building; wall tiles, not of metal, for building; modular wall panelling of non-metallic materials; non-metallic decorative panelling; panelling of non-metallic materials for use in construction; wall panelling made of wood; wood panelling