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Latitude: 51.6029 / 51°36'10"N
Longitude: -0.3914 / 0°23'28"W
OS Eastings: 511504.346
OS Northings: 190566.5727
OS Grid: TQ115905
Mapcode National: GBR 4C.N0G
Mapcode Global: VHFST.5ZG2
Entry Name: Grim's Ditch: section N of Blythwood House
Scheduled Date: 11 October 1944
Source: Historic England
Source ID: 1002007
English Heritage Legacy ID: LO 76
County: Harrow
Electoral Ward/Division: Pinner
Built-Up Area: Harrow
Traditional County: Middlesex
Lieutenancy Area (Ceremonial County): Greater London
Church of England Parish: St Edmund the King, Northwood Hills
Church of England Diocese: London