London contrast resedential wealth and poverty?

[tali1]

What street/road of London has the sharpest contrast between wealth and poverty?
It must have these conditions -
The contrast must be of walkable or very short distance (so has to be a particular street /postcode) and it must be resedential properties compared -not business

[spudqueen]

Broxwood Way has council flats (or they used to be - I had a friend who lived in one). It overlooks Primrose Hill and rubs shoulders with VERY rich neighbours.

[tali1]

Had a Google street view and initially Broxwood Way seemed okay - but the dead end (complete with a gang of teenagers) part is certainly a sharp contrast