C.1 Development is not permitted by Class C if it would consist of—
(a)in the case of any Class C(a) development, the installation of a structure exceeding 17 cubic metres in capacity;
(b)in the case of any Class C(e) development—
(i)the erection of a building or the reconstruction or alteration of a building where its design or external appearance would be materially affected;
(ii)the installation or erection by way of addition or replacement of any plant or machinery which would exceed 15 metres in height or the height of any plant or machinery it replaces, whichever is the greater; or
(iii)development, not wholly within a bus or tramway station, in pursuance of powers contained in transport legislation.