I lived in DR from 85 to 08 and I believe that less than half of adults had a car.
Bearing in mind many of the buildings have multiple occupancy there is room for max 1.5 cars outside each house.

The pavement is not wide. Surely pedestrians are more important to the local economy than drivers. I never used my car for journeys within SE23 and assume most DR residents do the same.

Surely we have to price a lot of these vehicles of the road. I know it might sound brutal but maybe you should only own a car if you have a dedicated parking space. It will have to happen sooner or later , why not sooner.