Enfield Council are consulting on these Quieter Neighbourhood treatments for the Fox Lane area. (which includes the Lakes Estate). They include "encouragement" of a 20mph zone supported by enhanced signage using large planter boxes, road narrowing, continuous footways, road humps, "fake road humps" (!), and points no entry.
Plus a school street.
This proposal is interesting in that the location of the (many) planter boxes remains flexible and is an opportunity for a trial to see what works, or use additional boxes.