The Town and Country Planning (General Permitted Development) (England) Order 2015 (GPDO), SI 2015/596, Sch 2 Pt 2, Class A grants permitted development rights in relation to the ‘erection, construction, maintenance, improvement or alteration of a gate, fence, wall or other means of enclosure’, subject to certain conditions and exceptions. Development is not permitted by Class A if— ‘…(a) the height of any gate, fence, wall or means of enclosure erected or constructed adjacent to a highway used by vehicular traffic would, after the carrying out of the development, exceed— (i) for a school, 2 metres above ground level, provided that any part of the gate, fence, wall or means of enclosure which is more than 1 metre above ground level does not create an obstruction to the view of persons using the highway as to