L.1 Development described in Class L is not permitted if—
(a)the gross floor space occupied by the replacement plant or machinery would exceed by more than 15% the gross floor space of the plant or machinery it replaced;
(b)the development under Class L (together with any previous development under Class L) would result in the area occupied by buildings, plant or machinery on the site exceeding the original area occupied by buildings, plant or machinery by more than—
(i)50%; or
(ii)100 square metres,
whichever is the lesser;
(c)the height of any building as extended or altered would exceed—
(i)if within 10 metres of a boundary of the curtilage of the site, 5 metres; or
(ii)in all other cases, the height of the building being extended or altered or 15 metres, whichever is the lower;
(d)the height of any replacement plant or machinery would exceed—
(i)if within 10 metres of a boundary of the curtilage of the site, 5 metres; or
(ii)in all other cases, 15 metres;
(e)any part of the development would be within 5 metres of any boundary of the curtilage of the site;
(f)the development would lead to a reduction in the space available for the parking or turning of vehicles;
(g)the development would be—
(i)on article 2(3) land; or
(ii)in a site of special scientific interest;
(h)the building is a listed building or is within the curtilage of a listed building; or
(i)the site is, or contains, a scheduled monument.