One person who linked to it observed that this would never happen in Britain. He was thinking it in the context of no politician being sufficiently loved and admired; but I thought it in a different way.
No one chalks here. The sidewalks are too narrow or busy and it is too closely associated with grafitti=vandalism. I am certain I read an article the other year about children out drawing on sidewalks who were fined for public vandalism.
Are there even ever chalkings at British universities to advertise events? I do not remember them offhand; certainly not the way my US undergraduate institution was, the paved paths periodically alive with student government campaigns and a capella concert announcements. The university near where I grew up had yearly chalking competitions, an entire street pedestrianized and densely, elaborately drawn on down its length by competing artists and teams. I spent hours as a child drawing in chalk on the sidewalk in front of the house, transient artwork which faded with passing storms.