It starts at Hatch End in the London Borough of Harrow at a roundabout on the A410. It runs North from the roundabout and is known as Oxhey Lane. After 1 mile (1.6 km) it passes over the route of the Grims Dyke and Grimsdyke Golf Course is to the East. Very soon afterwards it passes in to Hertfordshire. At the border a white post with the shield of London on it marks the Greater London border. There is also a plate emblazoned with the name and arms of the former county of Middlesex. In the trees to the east, a BT microwave tower may be seen.
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