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A409 between A4140 and Harrow boundary, Harrow (Grid ref TQ154940) A4140 between A409 and A411, Hertfordshire (Grid ref TQ150940) A409 between Hertfordshire boundary and A411, Hertfordshire (Grid ref TQ156945) A411 between A4140 and A409, Hertfordshire (Grid ref TQ150946) A4140 between A410 and Harrow boundary, Harrow (Grid ref TQ160934) U, The Comyns, Hertfordshire (Grid ref TQ144943) A411 between A409 and A41(T), Hertfordshire (Grid ref TQ160950) A41 between A5183 / A5 and A411, Hertfordshire (Grid ref TQ164950) M1 between Harrow boundary and Harrow boundary, Harrow (Grid ref TQ169946) A41 between A411 and B462, Hertfordshire (Grid ref TQ150959) U, Algar Close, Harrow (Grid ref TQ159921) A411 between A41(T) and A5183, Hertfordshire (Grid ref TQ170951) A5 between Harrow boundary and A41, Harrow (Grid ref TQ173942) A409 between A410 and A4140, Harrow (Grid ref TQ149920) A410 between A409 and A4140, Harrow (Grid ref TQ160919) A41 between Hertfordshire boundary and A5183, Hertfordshire (Grid ref TQ175944) M1 between A41 and LA boundary, Barnet (Grid ref TQ175943) M1 between LA boundary and J5, Hertfordshire (Grid ref TQ147961) A41 between M1 spur and Barnet boundary, Barnet (Grid ref TQ176942) A410 between A4140 and A4140, Harrow (Grid ref TQ171923)