Probably High Barnet High Street. There are a few other contenders though: https://en.wikipedia.org/wiki/List_of_highest_points_in_London https://en.wikipedia

Probably High Barnet High Street. There are a few other contenders though: https://en.wikipedia.org/wiki/List_of_highest_points_in_London https://en.wikipedia.org/wiki/List_of_highest_points_in_Lond...