The area bounded by a line commencing at a point on the district boundary at Colston Road grid reference NS 6078 6928, westwards along the centre line of Colston Road to a point grid reference NS 6026 6934; then northeastwards along the bed of a railway to rejoin the district boundary at a point grid reference NS 6031 6941; then southeastwards, eastwards and again southeastwards along that boundary to the point of commencement.