Grim's Ditch

The three scheduled stretches are "Grim's Ditch: section extending 1500yds (1370m) NE from Oxhey Lane", NHLE 1002044, over 5.26 hectares; "Grim's Ditch: four linear sections between Uxbridge Road and Oxhey Lane", NHLE 1003530, over 2.83 hectares; and "Grim's Ditch: section N of Blythwood House", NHLE 1002007, over 0.80 hectares. The earthwork is thought to have been built by the Catuvellauni tribe as a defence against the Romans, and it extended east to west about 6 miles (9.7 km) from the edge of Stanmore to Pinner Green and Cuckoo Hill; the surviving earthworks start mid-way, at Harrow Weald Common. A related earthwork survives to the east and is scheduled separately as "Linear earthworks in Pear Wood, W of Watling Street", NHLE 1001996, over 0.40 hectares. Eight scheduled monuments lie wholly inside the borough and three of the eight are Grim's Ditch sections; a ninth, Brockley Hill Romano-British pottery and settlement, NHLE 1018006, straddles the Harrow and Barnet boundary. Hatch End station is 1,898 m from the centre of the Oxhey Lane section at grid reference TQ 13900 92907, and that section runs 1,370 m, so its nearer end is closer.