It's war - but not as we know it
When you look at this picture, what do you see? A fairly ordinary planting in a roundabout? Look closer. When was the last time you saw palms, fir trees, rudbeckia, lavender and rosemary in a Local Authority planting list - at least, in London? What you are seeing is a manifestation of Guerilla Gardening, really. people that sneak out in the dead of night and ... plant things.
This roundabout, in a desolate corner of South London had been totally forsaken untill these guerillas struck. Here is the Wikipedia article.