Development by or on behalf of the Historic Buildings and Monuments Commission for England, consisting of—
(a)the maintenance, repair or restoration of any building or monument;
(b)the erection of screens, fences or covers designed or intended to protect or safeguard any building or monument; or
(c)the carrying out of works to stabilise ground conditions by any cliff, watercourse or the coastline;
where such works are required for the purposes of securing the preservation of any building or monument.