The Town and Country Planning (General Permitted Development) Order 1995

B.1    Development not permitted

Development is not permitted by Class B if—

(a) the development would be carried out on a separate parcel of land forming part of the unit which is less than 0.4 hectare in area;

(b) the external appearance of the premises would be materially affected;

(c) any part of the development would be within 25 metres of a metalled part of a trunk road or classified road;

(d) it would consist of, or involve, the carrying out of any works to a building or structure used or to be used for the accommodation of livestock or the storage of slurry or sewage sludge where the building or structure is within 400 metres of the curtilage of a protected building; or

(e) it would relate to fish farming and would involve the placing or assembly of a tank on land or in any waters or the construction of a pond in which fish may be kept or an increase (otherwise than by the removal of silt) in the size of any tank or pond in which fish may be kept.