The persons who may exercise the functions conferred by—
section 40 of the Public Health Acts Amendment Act 1890 (cabmen's shelters);
section 42 of that Act (statutes and monuments);
section 14 of the Public Health Act 1925 (public drinking fountains, seats, etc. ),
shall, in relation to a trunk road for which the Secretary of State is highway authority, include the Secretary of State and, in relation to a trunk road for which a strategic highways company is the highway authority, include that company.