The Crop Residues (Restrictions on Burning) Regulations 1991

4.  No crop residue may be burned–

(a) if the area to be burned is less than 150 metres from any other area in which crop residues are being burned;

(b) in the case of cereal straw or cereal stubble, less than 15 metres, and in any other case less than 5 metres from–

(i) the trunk of any tree (including any tree in coppice or scrubland);

(ii) any hedgerow;

(iii) any fence not the property of the occupier of the land upon which the burning is carried out;

(iv) any pole which is or may be used to carry telegraph or telephone wires;

(v) any electricity pole, pylon or substation;

(c) in the case of cereal straw or cereal stubble, less than 50 metres, and in any other case less than 15 metres from–

(i) any residential building;

(ii) any structure having a thatched roof;

(iii) any building, structure, fixed plant or machinery which could be set alight or damaged by heat from the fire;

(iv) any scheduled monument which could be set alight by the fire;

(v) any stack of hay or straw;

(vi) any accumulation of combustible material other than crop residues removed in the making of a fire-break;

(vii) any mature standing crop;

(viii) any woodland or land managed as a nature reserve;

(ix) any building or structure containing livestock;

(x) any oil or gas installation on or above the surface of the ground; or

(d) less than 100 metres from–

(i) any motorway;

(ii) any dual carriageway;

(iii) any A-road;

(iv) any railway line.